Agate Bibliography

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2514Pabian, R. K.1970aGemstone occurrences in Nebraska [Abstract]: Nebraska Academy of Sciences, Proceedings, 80th Annual Meeting, p. 35 - 36.
2515Pabian, R. K.1970bRecord in Rock, a handbook of the Invertebrate Fossils of Nebraska: University of Nebraska, Conservation and Survey Division, Educational Circular 1, 99p.
2516Pabian, R. K.1971Minerals and Gemstones of Nebraska: Conservation and Survey Division, University of Nebraska, Educational Circular 2, 80 p.
2517Pabian, R. K.1975Collecting Nebraska's Colorful Agates: Farm, Ranch, and Home Quarterly, University of Nebraska, Institute of Agriculture and Natural Resources. Summer, 1975, 2 p.
2518Pabian, R. K.1977Inclusions in agates from the Late Precambrian Keweenawan Basalts of the Lake Superior Region, Minnesota and Michigan: Proceedings, Nebraska Academy of Sciences. 87th Annual Meeting, April 15-16, 1977. [Abstract], p. 42-43.
2519Pabian, R. K.1978Inclusions in Agates and Their Origins and Significance: Gems and Gemology, v. 16, no. 1, p. 16-28.
2520Pabian, R. K.1980aLake Superior Agates: a Historical Review: Lapidary Journal, v. 34, no. 1, p. 110-120, 146-153.
2521Pabian, R. K.1980bGem Collecting in Nebraska: Lapidary Journal, v. 34, no. 2, p. 462 - 476. Nebraska Blue Agate, Fairburn Agates, Deuel County, Palm Wood, Laker Superior Agates, Jasper, Honey Agate.
2522Pabian, R. K.1980cLake Superior Agates: Characteristic Structures and Inclusions: Lapidary Journal, v. 34, no. 6, p. 1284-1299.
2523Pabian, R. K.1980dNebraska Portfolio: Rocks and Minerals, v. 55, no. 3, p. 107-108.
2524Pabian, R. K.1982aInclusions in agates from the late Precambrian (Keweenawan) basalts from the Lake Superior Region, Minnesota and Michigan: Symposium Proceedings. Scottish Mineral and Lapidary Club, Royal Scottish Museum, Chambers Street, Edinburgh. p. 64-75.
2525Pabian, R. K.1982bRivers, rockhounds, canoes, and collecting: Lapidary Journal, v. 36, no. 1, p. 76-82. Color photographs, chert, Deuel County Wood, Honey Agates, Lake Superior Agates, Jaspers, in place materials.
2526Pabian, R. K.1998Recognition of ancient chalcedony filled spherulites, or in search of ancient thunder eggs: Proceedings, Nebraska Academy of Sciences, 108th Annual Meeting, p. 50.
2527Pabian, R. K., and A. Zarins1991Chaos and Fractals as Explanations for the Origins of Certain Structures and Inclusions in Agates: Proceedings, Nebraska Academy of Sciences, 101st Annual Meeting, p. 61.
2528Pabian, R. K., and A. Zarins1991 1992aAccessory Mineralization in Amygdaloidal Agates: An Overview: Proceedings, Nebraska Academy of Sciences. 102nd Annual Meeting. p. 70.
2529Pabian, R. K., and A. Zarins1991, 1992bStratigraphic Distribution and Environments of Deposition Relating to the Origin of Banded Agates: Abstracts with Programs. Geological Society of America. North Central Section. Iowa City, Iowa. April 30, May 1, 1992, v. 24, no. 3, p. 58.
2530Pabian, R. K., and A. Zarins1991, 1994Banded Agates: Origins and Inclusions: Univerrsity of Nebraska Conservation and Survey Division, Educational Circular 12, 32 p.
2531Packer, C. S.1969Jasp-Agate inspires new hobbyist: Lapidary Journal, v. 23, no. 6, p. 888-890.
2532Page, V. M.1960aHow to identify fossil wood: Gems and Minerals, no. 270, p. 18-23
2533Page, V. M.1960bHow to identify fossil wood: Gems and Minerals, no. 271, p. 24-31
2534Page, V. M.1960cHow to identify fossil wood: Gems and Minerals, no. no. 272, p.23-27
2535Page, V. M.1960dHow to identify fossil wood: Gems and Minerals, no. 273, p. 29-32
2536Page, V. M.1960eHow to identify fossil wood: Gems and Minerals, no. 274, p. 23-28: no. 275, p. 23-27.
2537Page, V. M.1960fHow to identify fossil wood: Gems and Minerals, no. 275, p. 23-27.
2538Pagnucco, J. W.1959Flint Ridge Flint: Earth Science, v. 12, no. 3, p. 89-92. Ohio.
2539Pallister, H. D.1955Index to the minerals and rocks of Alabama: Geologoical Survey of Alabama, Bulletin 65. 55p.
2540Palmer, A1963Much ado about nothing or --- how not to find opals: Lapidary Journal, v. 17, no. 3, p. 408.
2541Palmer, W. C.1981Portland regional gem show: Lapidary Journal, v. 35, no. 7, p. 1472-1473. "Stinkingwater" oak.
2542Palmer, W. S.1935Gold in petrified wood: Rocks and Minerals, v. 10, no. 7, p. 102-103. Nevada.
2543Pannuti, U.1980Le Gemme: in Sansoni, G. C. (editor), Il Tesoro di Lorenzo il Magnifico: Stabilimento Grafico Commerziale, Firenze, p. 1-124.
2544Papke, H. A.1908A visit to the mineral localities at Paterson and Great Notch, N. J: The Mineral Collector, v. 15, no. 8, p. 114.
2545Parker, M. C.1941Montana dendrites: The Mineralogist, v. 9, 7, p. 254-255.
2546Parker, R. E.1963Hunting fire agates and opals in Mexico: Lapidary Journal, v. 17,no. 7, p. 740.
2547Parkinson, J.1901The hollow spherulites of the Yellowstone and Great Britain: Quarterly Journal of the Geological Society of London, v. 57, p. 211-225.
2548Parks, G. A.1984Surface and interfacial free energies of quartz. Journal of Geophysical Research, v. 89, no. B6, p. 3997-4008.
2549Parliman, C. R.1960New agate fields in old Mexico: Lapidary Journal, v. 14, no. 1, p. 4, 5, 7. High Fidelity Agate, Dog's Head Agate.
2550Parsons, A. L.1934The utilization of semi-precious and ornamental stones of Canada: University of Toronto Studies, Geological Series, no. 36, Contributions to Canadian Mineralogy for 1934, p. 13-21, plate III. Scots Bay, Nova Scotia agate illustrated.
2551Parsons, A. L.1938Additional semi-precious and ornamental stones of Canada: University of Toronto Studies, Geological Series, no. 41, p. 45-48.
2552Parsons, C. J.1965Practical Gem Knowledge for the Amateur, part 11 of a series: Lapidary Journal, v. 19, no. 6, p. 694-700.
2553Parsons, C. J.1967aPractical Gem Knowledge for the Amateur, part 33-A of a series: Lapidary Journal, v. 21, no. 6, p. 794-799. Hauser Bed, Wiley Well, Crazy Lace, Panama, Potato Patch, Priday, Buddstone, Coon Hollow, all illustrated.
2554Parsons, C. J.1967bPractical Gem Knowledge for the Amateur, part 33-B of a series. Lapidary Journal, v. 21, no. 7, p. 894-899. Nipomo Pyrite, Turitella, Bog Jasper from California, illustrated.
2555Patton, H. B.1896Concretions of chalcedony and opal in obsidian and rhyolite in Colorado: Reprinted from a paper presented at the November 4, 1895 meeting, Golden Colorado, Colorado Scientific Society Proceedings, no. 5, p. 165-170. Del Norte area.
2556Patton, J. W.1936The Mint Canyon Agate Beds in California: Rocks and Minerals, v. 11, no. 9, p. 156-159.
2557Patton, J. W.1938Thunder Eggs: Rocks and Minerals, v. 13, no. 12, p. 370-372. California, Opal Mountain, Hankley.
2558Pauling, L.1980The nature of silicon - oxygen bonds: American Mineralogist, v. 65, p. 321-323.
2559Pavlov, G. F., and Vorsepnev, V. V.1992Chalcedonian mineralization in North-East Russia [abstract]: in International Conference on Arctic Margins, K. V. Tracy et al, editors, ICAM, Anchorage, Alaska, p. 48. Meeting, September 2-4, 1992, Anchorage, Alaska.
2560Pearce, E. W.1966A feminine view of rock-hunting: Rocks and Minerals, v. 41, no. 8, p. 584-587. Nova Scotia
2561Pearl, R. M.1942aChalcedony in Colorado , (Part I): The Mineralogist, v. 10, no. 1, p. 7, 8, 29, 30. Curio Hill, 6.5 miles South of Canon City, Fremont County, bloodstone.
2562Pearl, R. M.1942bChalcedony in Colorado, (Part II): The Mineralogist, v. 10, no. 3, p. 75, 76, 98, 99.
2563Pearl, R. M.1948Two Colorado Mineral localities: The Mineralogist, v. 16, no. 10, p. 453-455. Austin Bluffs, East of Colorado Springs.
2564Pearl, R. M.1953aA Colorado Petrified forest: The Mineralogist, v. 21, no. 4, p. 147 - 151.
2565Pearl, R. M.1953bColorado gem trails, 2nd edition: Mineral Book Company, Box 183, Colorado Springs, Colorado. 125 p.
2566Pearl, R. M.1964American Gem Trails: McGraw-Hill Book Company, New York. 175 p.
2567Pearl, R. M.1965Colorado gem trails and mineral guide: ?2nd revised edition. Sage Books, Denver, Colorado. 223 p.
2568Pearl, R. M.1978How to tell synthetic opal: Earth Science, v. 31, no. 4, p. 153.
2569Pearsall, H. E.1948aAn 8000 Mile Gem Collecting Trip. Part 1. Lapidary Journal, v. 1, no. 4, p. 182, 184, 188-191.
2570Pearsall, H. E.1948bAn 8000 Mile Gem Collecting Trip, Part 2: Lapidary Journal, v. 2, no. 1, p. 34, 36, 38-42.
2571Pearsall, H. E.1948cAn 8000 Mile Gem Collecting Trip, Part 3: Lapidary Journal, v. 2, no. 2, p. 110, 112, 114, 115.
2572Pearsons, H. L.1964More B. C. Gem Trails: Monte Lake Rock Shop, Monte Lake, British Columbia, Canada. 38 p.
2573Pearsons, H. L.1968B.(ritish) C.(olumbia) Gem trails , (3rd edition): 30 pp. (no more data).
2574Peck, D. L.1964Geologic Reconnaissance of the Antelope-Ashwood Area North-Central Oregon: U. S. Geological Survey Bulletin 1161-D, 26 p.
2575Pederson, B. C., and Pederson, C. M.1961Montana agate...a most fascinating gemstone: Lapidary Journal, v. 15, no. 2, p. 254-255. Reprinted in Agates of North America, fill in details, RKP.
2576Pelto, C. R.1956A study of chalcedony: American Journal of Science, no. 254, p. 32-50.
2577Pence, V., and B. Stewart1960The Canal Zone Gem and Mineral Society's field trip to Panama's Prelas Islands, December 5 & 6, 1959. Rocks and Minerals, v. 34, no. 9, 10, p. 435-439.
2578Pendergast, D. M.1969Ancient Mayan Lapidaries: Lapidary Journal, v. 23, no. 8, p. 1132-1146.
2579Peng, C. J., and Amstutz, G. C.1971Limonitic Banding in a Rhyolitic Welded Tuff. Chemie der Erde, v. 29, p. 259-276.
2580Pense, J.1956/1957Achat unter dem Elektronen-mikroskop: Zeitschriften Deutsches Gesselschaft fur Edelsteinkde., v. 18, p. 7-10. (Not seen).
2581Pense, J.1959Zum electronenmikroskopischen Faserbau des achates: Zeitschriften Deutsches Gesselschaft fur Edelsteinkunde, v. 27, p. 3-4. (Not seen).
2582Pense, J.1961, 1962Electronmfikroskopische Untersuchungen zur Fasertextru des Achates: Zeitschriften Deutsches Gesselschaft fur Edelsteinkunde, v. 38, p. 12 - 30. (Not seen).
2583Pense, J.1964Zur sublichtmikroskopischen Morphologie des Chalcedons: Fortschritte Mineralogie, v. 41, p. 166. (Not seen).
2584Pense, J.1966Zur sublichtmikroskopischen Morphologie des dryptokristallinen Silicumdioxids: Habilitationschrift. Mainz. (Not seen).
2585Pepper, S. J.1980Beachcombing in southern California: Gems and Minerals, no. 514, p. 36.
2586Pepper, S. J.1981aA visit to the Gingko Petrified Forest, Washington: Lapidary Journal, v. 35, no. 5, p. 1050-1052.
2587Pepper, S. J.1981bCalifornia rockhound visits Florida: Lapidary Journal, v. 35, no. 7, p. 1484-1488.
2588Pepper, S. J.1982A carefree adventure: Lapidary Journal, v. 36, no. 6, p. 1104-1105. Cave Creek, Arizona.
2589Perkins, E. H.1922A catalogue of Maine Minerals. Maine Naturalist, v. 2, p. 43-47, 95-95, 159-162. (Not seen in its entirety).
2590Perkins, E. H.1924A catalogue of Maine Minerals: Maine Naturalist, v. 4, p. 45 - 49, 110-115. (Not seen in its= entirety).
2591Perkins, G. H.1931Minerals of Vermont: State Geologist, 17th Annual Report for 1929, 1930. Burlington, Vermont. p. 151-178.
2592Perry, H.1959Historic Idar-Oberstein: Earth Science, v. 12, no. 1, p. 13-14. Lapidary article.
2593Perry, L.1976aThe Opal Hill Fire Agate Mine: Gems and Minerals, no. 461, p. 56, 57, 77.
2594Perry, L.1976bAgate in Augustine Canyon: Gems and Minerals, no. 469, p. 48-49. California, field trip.
2595Perry, L.1979There are gems in those "worked out" fields: Gems and Minerals, no. 505, p. 24.
2596Perry, L.1984Wiley Well revisited: Gems and Minerals, no. 565, p. 67-71.
2597Perry, L. E.1961Varied agate types and locations in California: Lapidary Journal, v. 15, no. 3, p. 308-314.
2598Perry, N. & R.1967Australian Gemstones in Colour: Charles E. Tuttle Company, Rutland, Vermont, and Tokyo, Japan. 112 p. Color illustrations, Queensland Agate Blue agate, Carnelian, Chalcedony, Chert, chrysoprase, opal, ribbonstone, boulder opal, jelly opal, blue moss opalite, goldlace opalite, opalised (sic.) wood, petrified wood. Tasmania, Mt. Isa, Queensland. Murgan? district?
2599Perry, O. P. A., Rev.1950Eden Valley Wood is Different: Lapidary Journal, v. 4, no. 1, p. 16, 18, 20, 22, 24, 26. Probably the same person as O. P. Avery who advertizes Eden Valley wood on page 26, above.
2600Persiel, E. A., Smith, D. C., Photiades, A. D., and Zindors, G.1996Preliminary data from the Raman spectroscopy of different forms of SiO2 in Mn-rich banded cherts from two regions of the Peloponnese, Greece [Abstract]: Terra Nova Abstract Supplement, v. 2, p. 10.
2601Person, R. A.1975Crazy Lace near Francois Lake, British Columbia: Lapidary Journal, v. 29, no. 9, p. 1730-1736.
2602Person, R. A.1976Agate on Flaking Stone Mountain: Gems and Minerals, no. 462, p. 10, 71-73. New Mexico, field trip.
2603Person, R. A.1977aRockhound honeymoon: Lapidary Journal, v. 30, no. 12, p. 2694-2698. South Dakota, Oregon, vistaite, Prineville area.
2604Person, R. A.1977bRockhunting with the tides near Parsboro, Nova Scotia.: Lapidary Journal, v. 31, no. 1, p. 126-136. Color Illustrations, Gold Plume Agate.
2605Person, R. A.1977cRainbows of agate in Scots Bay, Nova Scotia: Lapidary Journal, v. 31, no. 2, p. 482-488. Color illustrations, rainbows of agate, gold moss agate.
2606Person, R. A.1977dWalk to an island for gemstones and crystals: Lapidary Journal, v. 31, no. 3, p. 690-695, 712-714. Color illustrations.
2607Peters, E. G.1947A Woman Rockhound in Central Oregon: Lapidary Journal, v. 1, no. 1, p. 30-31. Field Trip
2608Peters, M. F.1966Connoisseur of Bola Ties: Lapidary Journal, v. 19,no. 10, p. 1108 -1110. Colored photos.
2609Petersen-Fagerstam, W.1953Modern Agate Costume Jewelry: Lapidary Journal, v. 6, no. 6, p. 462-463.
2610Peterson, B. M.1972Pete Curto's Copper Country: Lapidary Journal, v. 26, no. 9, p. 1304-1308. Lake Superior Agate.
2611Peterson, I.1988The Mathematical Tourist, snapshots of modern mathematics: W. H. Freeman and Company, New York. 240 p.
2612Peterson, J. V.1965The Columbian Plateau: Earth Science, v. 18, no. 5, p. 200 - 203. Oregon, Washington, petrified wood.
2613Petkof, B.1964-1966U.S. Bureau of Mines, Minerals yearbooks: Mineral facts and problems, 1965 edition.
2614Petmecky, B. J.1960Rock hunting in Meixco: Lapidary Journal, v. 14, no. 1, p. 42, 44, 46-47.
2615Petrusenko, Svetoslav1991Kamienie szlachetne i ozdobne Bulgarii [Precious stones and ornaments of Bulgaria]: Mineralogia Polonica, v. 22, no. 1, p. 81-88.
2616Pettijohn, F. J.1975Sedimentary Rocks: Harper and Row, 628 p.
2617Petzold, A., and Hinz, W.1979Silikatchemie: Stuttgart.(No further details, seen cited, but not seen).
2618Phetteplace, J.1959Practical Lapidary Hints: Earth Science, v. 12, no. 6, p. 198-200. Picture jaspers, cutting , field collecting.
2619Phillips,J. A.1873Note on the silicified woods of California: Geololgical Magazine, v. 10, first series, p. 98-99.
2620Phillips K. W.1844An elementary treatise on mineralogy, 5th Edition: Descriptive Mineralogy, Pt. 2. p. 10-16. William D. Ticknor & Co., Boston, 662 p. Numerous old-world localities.
2621Pickering, K. L.1981aIn quest of the North Fife Hills: Gems, v. 13, p. 23 - 25.
2622Pickering, K. L.1981bThe Dulcote Agates: Gems, v. 13, no. 5, p. 29-32.
2623Pierce, M. L., and Christie, J. M.1987Kinetics of grain growth in quartz aggregates, [Abstract]: EOS Transactions of the American Geophysical Union, v. 68, no. 16, p. 422.
2624Piezcka, A., and Holcer, Z.2000Agates of the Cracow region compared with other occurrences I Poland: in Geology and Petrology of the Upper Silesia and the Malopolska terranes boundary zone: papers of the 7th meeting of the Petrology Group of the Mineralogical Society of Poland (Wyszomirski, P., editor) Prace Specjalne-Polskie Towarzystwo Mineralogiczne 17, p. 60-62.
2625Pilipenko, P. P.1934Zur Frage der Achatengenesis (russ. mit dt. Zusammenf.): Bulletin Societie Naturalistes de Moscou, Sect. geol. v. 12, p. 279-299. (Not seen). [Russian with German ?Translation].
2626Pisciotto, K. A.1981Diagenetic trends in the siliceous facies of the Monterey Shale in the Santa Maria region, California: Sedimentology, v. 28, no. 4, p. 547-571.
2627Pitman, S. S., Jr.1959Silica in Edwards Limestone, Travis County, Texas: Silica in Sediments: Special Publication Society of Economic Paleontologists and Mineralogists and American Association of Petroleum Geologists, p. 121-124.
2628Platen, P.1908aUntersuchung fossiler Holzer aus dem Western Vereinigten Staaten von Nordamerika: Universitat Leipzig. Innaugural Dissertation, Philosophischen Fakultat, separately issued, Gressner and Schramm. 156 p.
2629Platen, P.1908bibidem: Naturforschende Gesselschaft zu Leipzig, Sitsungsberichte v?. 34 p. 1-164.
2630Platen, P.1909Die fossilen Walder am Amethyst-Mount im Yellowstone-Nationalpark und die mikroskopische Untersuchung ihrer Holzer: Prometheus, v. 20, p. 241 - 246. (Not seen).
2631Platt, R. E.1955aNew Wyoming petrified forest: The Mineralogist, v. 23, no. 2, p. 68-70.
2632Platt, R. E.1955bA Rock Journey in Wyoming: Lapidary Journal, v. 9, no. 1, p. 68-71. Muddy Gap, Home on the Range, Riverton, SW Wyo, Wind R.
2633Playfair, J.1802Illustrations of the Huttonian Theory of the Earth: William Creech, Edinburgh, p. 78-79.
2634Pliny the Elderca. 79Historia Naturalis: Numerous translations available.
2635Plodowski, G., and Werner, R.1981Achate: Kleine Senckenberg-Reihe, No. 12, 39 p.
2636Pluard, N.1978Our three month trek: Lapidary Journal, v. 32, no. 9, p. 1952-1963. Field trip, Wyoming's Red Desert, Blue Forest.
2637Pluard, N.1984Arizona---second time is best: Lapidary Journal, v. 38, no. 8, p. 1124-1131.
2638Plyusnina, I. I.1978Study of structural disorder of chalcedonies by infrared spectroscopy: Soviet Physic. Doklady., v. 23, no. 6, p. 363-365.
2639Plyusnina, I. I.1979Infrared study of cryptocrystalline formations of silica, I: Chalcedonies, Arch. Mineral. v. 35, no. xx, p. 19-31.
2640Plyusnina, I. I., and Sergeeva, N. E.1981A study of the disordering of quartz and chalcedony by the methods of infrared spectroscopy and electron microscopy: Moscow University Geological Bulletin, v. 36, no. 1, p. 37-42.
2641Poese, W.1953Gem cutter visits Idar-Oberstein: The Mineralogist, v. 21, no. 12, p. 469, 470, 472.
2642Pohl, J. C., Jr.1943The Calvert Collection: Rocks and Minerals, v. 18, no. 8, p. 240-241. Calvert, John, Lord.
2643Poindexter, O. F., and others1965Rocks and Minerals of Michigan: Michigan Geological Survey Bulletin 2, (= Publication 42), 5th edition, revised, 104 p. (Problem area)
2644Poldervaart, A.1971Volcanity and forms of extrusive bodies: in Green, J, and Short, N. M., (editors), Volcanic landforms and surface features. Springer-Verlaag, Berlin-Heidelberg, p. 1 - 18.
2645Pond, A. W.1930Primitive methods of working stone: Logan Museum Bulletin, v. 2, no. 1. (Logan Museum does not appear in the directory of the American Association of Museums. Alonzo William Pond appears as an author of a paper dealing with weather in the Central Gobi Desert of Mongolia, an area cited as being rich in agate prehistoric artifacts made from agate and agatized wood.)
2646Pope, D. E.undatedLouisiana's Minerals: Louisiana Geological Survey, Baton Rouge, Louisiana, 2 p.
2647Porter, A. A.1955A Washington State Collecting Area: Lapidary Journal, v. 9, no. 1, p. 66, 67. Silver Lake, Cedar Creek, Salmon River, Cupid River, East Canyon Creek, Randall, Washington.
2648Porter, D. A.1894 (1895)Notes on Some Minerals and Mineral Localities in the Northern Districts of New South Wales: Journal of the Royal Society of New South Wales xxviii, 1894 (1895), p. 39 - 44.
2649Porter, W. P.1979Opaline outgrowths on Lee Formation sandstones in Wise County, Virginia. Rocks and Minerals, v. 54, no. 3, p. 97-100.
2650Potchick, P. F.1952Mineral collecting at Crestmore, California: Rocks and Minerals, v. 29, no. 3, 4, p. 130-135. Opalized wood
2651Potter, R. M. and Rossman, G. R.1964Mineralogy of manganese dendrites and coatings: American Mineralogist, v. 64, p. 1219-1226.
2652Pough, F. H.1982Japanese manmades: Lapidary Journal, v. 35, no. 10, p. 2004-2008. Synthetic opal.
2653Pough, F. H.1985Spectral gemstones. Frozen rainbows: Lapidary Journal, v. 38, no. 6, p. 19-21. Iris agate illustrated.
2654Pough, F. M.1973Common opal and fire agate: Jewellers Circular Keystone. May. p. 108, 149-150, 153.
2655Powell, R. D.1940Agates by the hundredweight: The Mineralogist, v. 8, no. 10, p. 410.
2656Pozharevski, I.1989Proyavleniya na yuvelirni raznovidnosti na silitsievha dvuokis v rayona na Momchilgrad [Localities of silica gem varieties in Momchilgrad area]: Rudoobrazuvatelni Protsesi I Mineralni Nakhodista (Ore formation processes and mineral deposits), v. 30, p. 37-45.
2657Pratt, E. M.1952Agate - gemstone of the ancients, The Mineralogist, v. 20, no. 11, p. 394, 396.
2658Pratt, J. H.1901Gems and gem mining in the South: The Southland, v. 1, p. 1-5, 67-71, 118-122. (Not seen).
2659Pratt, J. H.1933Gems and gem minerals of North Carolina: Ameican Mineralogist, v. 18, no. 4, p. 148-159.
2660Pratt, M., and M. Menzel1965Iowa has something for everyone: Gems and Minerals, no. 334, p. 14-19. Iowa, field trip.
2661Pratt, W. L.1942Siliceous oolite near Centerville, Alabama: Rocks and Minerals, v. 17, no. 10, p. 345.
2662Prchal, M.1968a"Dryhead"---Montana's fortification agate: Lapidary Journal, v. 22, no. 4, p. 580-583.
2663Prchal, M.1968bMontana's dendritic moss agate---is it all gone? Lapidary Journal, v. 22, no. 5, p. 620-631.
2664Prchal, M.1969A petrified forest above the timberline: Lapidary Journal, v. 23, no.6, p. 804-807.
2665Predmore, P.1941"Thunder Eggs": The Mineralogist, v. 9, no. 2, p. 54.
2666Preston, N. E.1988A family outing in S.E. Texas: Lapidary Journal, v. 41, no. 12, p. 61-62. Livingston Reservoir, Petrified Wood
2667Pretola, J. P.1995Optical mineralogical techniques for sourcing fine-grained quartz; a feasibility study using quartz polymorph ratios: [Abstract], Abstracts with Programs, Geological Society of America, Northeastern Section, 30th Annual Meeting, Cromwell, CT, March 10-12, 1995, v. 27, no. 1, p. 75.
2668Purchine, M.1967Chalcedony pseudomorph after coral, (cover story): Rocks and Minerals, v. 42, no. 2, p. 82. Florida
2669Purteet, B.1967Missouri names state rock and mineral: Earth Science, v. 20, no. 5, p. 215. Mozarkite.
2670Purvis, R.1971Treasure hunting in British Columbia: McClelland and Stearite, Ltd., Toronto, 143 p.
2671Pusl, W.1993Die Achatvorkommen von Sternberg bei Wackersdorf [Agate occurrences of Sternberg near Wackersdorf]: Der Aufschluss, v. 44, no. 3, p. 159-160.
2672Pye, G.1968Geology and Scenery: Rainy Lake and east to Lake Superior: Ontario Department of Mines Guidebook 1, 118 p.
2673Pye, G.1969Geology and Scenery: North Shore of Lake Superior: Ontario Deparetment of Mines Guidebook 2, 148 p.
2674Pyrite Pete1935Moss agate found: The Mineralogist, v. 3, no. 9, p. 27. Sunflower Flat, Quartz Butte, OR