 | | Journal (issue) | | Prices subject to change without notice. F.O.B. Los Angeles Add postage and ... lnsurence. Add ..1es tax...Design PENDANT with dainty chain 12x10 S 5.70 LOS ANGELES, CALIFORNIA 90042 Karet Gold prices ere fixed...Antonio, Texas 78228 FIELD TRIPS Rockhounding in Costa Rica, Part 2 by Rawleigh H. Ralls . . ..... .. . ...2 and 3. Los Alamos Geological Society. "Fourth Annual Earth Treasure Show." Rec. Hall, Los Alamos, N...and 10-6. Ed. Wortman, Frank Miley, P.O. Box 762, Los Alamos 87544. Dealers, demonstrations. Dec. 2 and |  | | Journal (issue) | | 8 . Los Angeles Add postage and Insurance Add Sales Tax In Callfornl• 4959 YORK BLVD. LOS ANGELES , CALIFORNIA...Temple, Texts 76501 DEPARTMENTS Rockhoundlng In Costa Rica by Rawleigh H. Ralls ..................... ....COLORFUL SOLID ILACK TREATED OPAL MATRIX CUT AND POLISHED CABOCHONS SPECIAL CUT OPAL PARCEL II QUALITY S 1...PRICE FOR PAIRS DOUBLE PLUS 15% HIGHEST GRADE GEM OPAL AIRMAIL SPECIAL • Selected rough from Coober Pedy...... $25.00 gram 3 OUNCES Red Flaah Coober Pedy Opal for Cutting Good Sized Cabs $22.00 FREE AIRMAIL |  | | Journal (issue) | | ........... 319 325 AGATES FOUND RECENTLY IN COSTA RlCA . . . . . . . . . . . . . . . . . . . . . ...as fluorite, wernerite-scapolite, hyalite, semi-opal and others which are best affected by the Jong wave...pale yellow. Phosphoresce strong green. Precio111 Opal-Australia- (large nwnber of specimens) Fluoresce...core fl uoresce a blue-white (these portions may be opal) . Light chalky earth adhering to outside of brown...near H elena in a long ridge of jasper and semi-opal and also an agate-jasper breccia. Near White Sulphur |  | | Show/Event (guide) | | have it mailed to you. ADVERTISER INDEX 17 A&S Opal. LLC...................................... Back...LLC Your American source for quality Australian Opal ROUGH • RUBS • CABOCHONS • CARVINGS A I''"’’ ... r The best selection of lightning ridge rough opal in Denver We've moved to the other side of the Coliseum...Design Show - Summer, Hilton Pasadena Hotel, 168 S Los Robles Ave, Pasadena, Garan-Beadagio, (530) 2741101...12-13, 2019. Recreation With Rocks, Los Altos Youth Center, Los Altos. October 2019 TBD. Woodland Hills |  | | Journal (issue) | | Include 1tone1;,except •• noted.) ,,1ce1 F.0 .1. Los A111elH Add posta1e a11d l11111ra11co. Add Sales...Sales Tax 111 Callfor11la 4959 YORK BLVD. LOS ANGELES, CALIFORNIA 90042 2 - AUGUST 1976 Open Mon. thru...96002 Mrs Jeanne Mager. Secretary 13245 Rhoda Dr . Los Altos Hills. CA 94022 • Edwin Porter. Treasurer...'>t7-ffi79 New Finds A. Gold 8;1,t' Cem Cl))tal Opal \\ tth n-c.l. him·. t1ra1111.1· & 1-(rt't'tt t•t1lt1ur...11t•,·1ali1,· 111 ( :,•111 ()11altt~ ( :11 ,tal opal. \\ t• ha, t' ht•t•n 111111u111. a11d ~l,·al11111 |  | | Journal (issue) | | ........................ 8 BUILDING STONE OF COSTA RICA .............................................................................. 20 SULFUR IN COSTA RICA AND GUATEMALA .................................somewhat like the basin and range physiographic province of Nevada. Many of the banks rise as much as 6000... 10 ROCKS AND MINERALS BUILDING STONE IN COSTA RICA Re s ( Bureau of Mines Mineral Trade Notes...building as well as ornamental purposes are found in Costa Rica. Marble of light-gray color with darker light-gray |  | | Report (issue) | | rocks near Dunlap and at Occurs near Eureka. Los Angeles Country Found in the schists at West Carbondale...: : Verdugo Canyon, ten miles northeast of Los Angeles. Mendocino County A deposit occurs about fifteen...Garlock : it occurs with the silver minerals. Los Angeles County and with cobalt : Native silver was...the oxides of copper and some native copper. Los Angeles County At the Free Cuba mine, near Acton. Mariposa...the cinnabar at Sulphur Bank, on Clear Lake. Los Angeles County: Specimens have been found in the mountains |  | | Show/Event (guide) | | art. AMBERMAN 650 S. Hill Street, Suite 513 Los Angeles, CA 90014 USA Tel: 213-629-2112 www.amberman... LIST OF EXHIBITORS ASCADE INTERNATIONAL 291 E. Los Rincones Green Valley, AZ 85614 USA Tel: +491-762-382-4294...stones. CHARLIE LEATHER 801 E. 7th St #104 Los Angeles, California 90021 USA Tel: 646-209-9180 www.charlieleather...ethiopianpridetrade.com Booth#: E303 Rough, cut & polished opal, aquamarine, tourmaline, amethyst, garnet, peridot... GEMCROWD.COM 650 S Hill Street, Suite 917 Los Angeles, CA 90014 USA Tel: 702-799-9855 www.gemcrowd |  | | Journal (issue) | | ............................. A ROCKHOUND IN COSTA RICA. By Robert Rex ................................Silurian rhyolite flows. Also is seen dendritic opal in a strata four inches in width that appears to...of plasma before being transformed into agate and opal. A curio5ity is a small hill on the top of the lar~e...Halotrichite: As whitish, silky fibrous crusts. Opal (Fio,·ite or Pearl Sinter): Occurs in tufa in botryoidal...appearances dead. lS ·e w ,J A ROCKHOUN D IN CO·STA RICA 1e By ROBERT REX d >r >r r- :y ,k llt IS |  | | Journal (article/letter/editorial) | | composite 25-35 ern ka -1. Organic carbon, carbonate, opal and terrigenous content analyses were made of the...with varying carbonate content (1-25%) and little opal «4%); they span 7700 years of record. Sediment cores...in the west and with an increase in the carbonate-opal east-west asymmetry between the two basins. The...Southern California, 3651 Trousdale Ave., ZHS 117, Los Angeles, California 90089-0740, USA 1 1. INTRODUCTION...further analyses. These included car bonate content, opal silica CARBONATE RECORD IN MEXICAN HOLOCENE SEDIMENTS |  | | Show/Event (guide) | | CA Hillsboro, OR Roseville, CA Santa Barbara, CA Costa Mesa, CA Del Mar, CA Pleasanton, CA Reno, NV Eugene...Santa Rosa, CA Sacramento, CA Santa Barbara, CA Costa Mesa, CA Tulsa, OK Salt Lake City, UT JOGS JOGSSHOW...Skull Silverland 318 W 6th Street, Suite #10 Los Angeles, California 90014 USA Tel: 213 623 4000 Booth#:...decor. aMBerMan 650 S. Hill Street, Suite 513 Los Angeles, CA 90014 USA Tel: 213-629-2112 www.amberman...turquoise, tigers eye slabs, rhododendron, opalite, opal eye. carol exquiSiTe faShion BouTique 1331 Hemlock |  | | Journal (article/letter/editorial) | | to be the biogenic opal tests of silica-secreting marine organisms. Biogenic opal (Si02' nR20) is chemically...dissolved and reprecipitated, first as opal-CT (a more ordered form of opal) and then as quartz (Jones & Segnet...history, and age of bedded chert. Biogenic silica from opal-secreting organisms such as radiolarians, diatoms...cement in bedded chert sequences. Biogenic silica, or opal-A, is an unstable amorphous form of hydrous silica...silica. With increasing time and temperature, opal-A undergoes a transformation to quartz, with an intermediate |  | | Journal (issue) | | Include stones;.except •• noted.) Prices F.O.I . Los A111eln Acid posto1e 011d l11s11ro11ce. Add Soles...Soles Tox 111 Callfor11lo 4959 YORK BLVD. LOS ANGELES, CALIFORNIA 90042 2 - SEPTEMBER 1976 Open Mon. thru...90808 Mrs. Jeanne Mager, Secretary 13245 Rhoda Dr., Los Altos Hills, CA 94022 J. Richard Swartz, Treasurer...018 ESPECIALLY FOR SLOTTING AND CUTTING TURQUOISE, OPAL AND FACETING MATERIALS. Supercharged with premium...with ,·olour New Finds A. Cold Base Gem Crystal Opal \\·ith red, blue, orange & green colour patterns |  | | Journal (issue) | | ) 4959 YORK BLVD. LOS ANGELES, CALIFORNIA 90042 2 - JUNE 1976 Prkes F.0.1. Los A••eles Add posta••...96002 Mrs. Jeanne Magar, Secretary 13245 Rhoda Dr., Los Altos HIiis, CA 94022 Edwin Porter, Treasurer P.O............ $1 .00 per l b. Opal, Mexico, black plume• in salmon color opal..............................slabs MAGER. Jeanne· Handcrafted Jewelry MALINE, Opal & Maury-Carvings MAI..KOW, Fem-Carvings MARIN PEGBOARDERS-Faceted...R-Ironwood carvings WALKER, Mr. & Mrs. Henry:-Are Opal WALSl;:!1,..BIU & Uvona-Cabochons WARNCJ\, Pat Carvings |  | | Journal (issue) | | 91607 Mrs. Jeanne Mager. Secretary 13245 Rhoda Dr.• Los Altos Hills, CA 94022 Edwin Porter. Treasurer P.O.............. $1.00 per lb. Opal, Mexico. black plumes in salmon color opal..............................Valley, NC. 9-? daily. J.C. Drake, 26 Spruce St.. Canton. NO 28716. Dealers. July 11 thru 13, Annual Midwest...10-10 and 10-6. Van MacDulf, 3633 Beethoven, Los Angeles, CA 90066. Dealer space filled. July 19 and 20...Lockheed Rockcrafters Trophy IX - G.P. Decker, Contra Costa Gem and Mineral Society Trophy XIII - Faye J. Safranek |  | | Book | | phases, from opal-A (amorphous biogenic silica) to opal-A’ (amorphous inorganic silica) to opal-CT (disordered...silica (opal-A from diatoms in these deposits) is metastable and easily transformed to opal-CT under...during the world wars in the United States, Japan, Costa Rica, New Zealand, and elsewhere. Compared to fluvial...accompanied by the mineralogic changes opal-A (biogenic silica) to opal-CT (disordered cristobalite-tridymite)...et al., 1978). Pure siliceous ooze transforms to opal-CT chert then to quartz chert. These transformations |  | | Book | | Associate Director Natural History Museum of Los Angeles County Featuring Photographs by Harold and Erica...was a gallery in the Natural History Museum of Los Angeles County, entitled "Gemstones and Their Origins...through the agency of surlace waters, focusing on the opal deposits of Australia. Part II of this book is devoted...exhibition at the Natural History Museum of Los Angeles County, would not have been possible without...invaluable input into the chapter on Australian opal deposits. The chapter on Colombian emeralds was | | | Book | | Associate Director Natural History Museum of Los Angeles County Featuring Photographs by Harold and Erica...was a gallery in the Natural History Museum of Los Angeles County, entitled "Gemstones and Their Origins...through the agency of surlace waters, focusing on the opal deposits of Australia. Part II of this book is devoted...exhibition at the Natural History Museum of Los Angeles County, would not have been possible without...invaluable input into the chapter on Australian opal deposits. The chapter on Colombian emeralds was |  | | Journal (issue) | | Boulevard, Los Angeles, Californla 90042 Telephone (213) 2 55-1488 Prices F.O.B. Los Angeles. Add postage...96002 Mrs. Jeanne Mager. Secretary 13245 Rhoda Dr . Los Altos Hills, CA 94022 Edwin Porter, Treasurer P.O...on the crown. New Finds A. Gold Base Gem Crystal Opal \\ ith red, blue, orange & green colour p attern...specialize in Gem Quality Crystal opal. \\' e have been mining and dealing in opal for 8 years. integrity and...BOOK ON OPAL • BEAUTIFUL COLOR PLATES • INFORMATION ON ALL THE AUSTRALIAN OPAL FIELDS! THE OPAL BOOK tells |  | | Journal (issue) | | WITH MINUTE MAN MAIL ORDER SYSTEM Prices F.O.B. Los Angel. . Add postage and insurance PleaN Nnd your...LAPIDARY AND JEWELERS SUPPLIES 4919 York Boulevard, Los Angel••• Celifomia 90042, Telephone (213) 211-1488...96002 Mrs. Jeanne Mager. Secretary 13245 Rhoda Dr., Los Altos HIiis. CA 94022 Edwin Porter. Treasurer P.O.............. $1.00 per lb. Opal. Mexico. black plumes in salmon color opal..............................York, take Highway 11 south towards Canton. Just before entering Canton take Highway 68 East from the intersection |  | | Book (edition) | | well as to Mr. and Mrs. Harold L. Van Pelt of Los Angeles for a number of color photographs of remarkable...PRINCIPAL GEMSTONES Diamond, Corundum, Beryl, Topaz, Opal. II 68 IMPORT ANT GEMSTONES The Feldspar Group...crystal forms 23. Views of opal mines, Spencer, Idaho 24. Nodules bearing opal, Spencer, Idaho 25. Drawing...of hyalite opal specimen, Mexico 26. Hyalite opal photomicrograph 2 7. Map of Honduras opal sources 28...Fen6meno mine, Baja California Axinite crystals, Los Gavilanes, Baja California Mina La Olivia, Baja California |  | | Report (issue) | | ................................. 19-20 Contra Costa Mineral & Gem Society, Inc. ........................................ 37-38 Gem Cutters Guild, Los Angeles..................................................................................... 58-59 Los Angeles L1.pidary Society .................................................................. 60-61 Los Angeles Mineralogical Society .........................23 & 24, 1956 Fresno Gem & Mineral Society 18 LOS ANGELES ............................................ |  | | Show/Event (guide) | | became our State Mineral, ogle huge boulders o f opal from Australia and get a taste of the things soon...in o u r spectacular selection of Lightning Ridge opal - from stunning one- o f -a-kind pieces to a large...am - 10:30 am ( G M R ) Mexico ... More Than Just Los "Why Collect Minerals" By Lamentos! By Dr. Peter...1:00 pm - 2:00 pm (GMR) Friday, February I Sth "Opal after Calcite after Ikaite and Dr.Alessandra Costanzo...Costanzo 9:30 am - 6:00 pm (MMR) (White Cliffs Opal Pineapple)" Arthur Roe Memorial By Graeme Dowton Micromount |  | | Journal (issue) | | V1ce-Prcsldcnt Mrs. Dorothy Cralg, 4139 So. Van Ness, Los Angeles, Secretary Pnul VandcrElke, Editor, RL 5, Dox...Place (corner 41st Place and E. Figueroa SU, Los Angeles. Every one Invited. Admlsslon free. -Walt Shirey...hard forbidding land. The eastern portion of the province is very fertile which is covered with flour ishing...Mlner&ll&hta. We are open every day except Monday. Los Ani:elH come by way of WhltUar Blvd. lo HJ1hway 39...Garnets, large pieces Al mandite, Matrix Mexican opal pre forms, rare cab gem material. THE LAPIDARY |  | | Journal (issue) | | American Museum of Natural History ( 190 I), Los Angeles Public Library and the U. S. National Museum...Regatta of the American Canoe Association, town of Canton, St Lawrence County, NY. Photograph with permission...(Gordonia District, Namaqualand, Northern Cape Province, South Africa). Two lots were available at the...part was that Mineralientage 2008 had emphasized opal as a central theme and the exhibit showed many fine...cluttered, only scant locality data was given for the opal specimens and there were no explanatory texts. Why |
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