 | | Journal (article/letter/editorial) | | 94720-4767, USA Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA Received 31 May...do not. Arrhenius plots for argon diffusion in plagioclase and alkali feldspars appear to reflect a confluence...Laboratory, 7000 East Avenue, Livermore, CA 94550, USA. E-mail addresses: cassata2@llnl.gov (W.S. Cassata)...et al., 1999). The kinetics of Ar diffusion in plagioclase, the most abundant mineral in Earth’s crust,...the fraction of degassed Ca-derived 37 Ar for plagioclase or K-derived 39Ar for alkali feldspar and the |  | | Journal (issue) | | Patterns in Opal Agate from Morocco Field Report on Oregon Sunstone Fall 2013 VOLUME 49, No. 3 EDITORIAL...pg. 162 FIELD REPORT 162 Three Occurrences of Oregon Sunstone Duncan Pay, Robert Weldon, Shane McClure...Chronicles a visit to the high desert of eastern Oregon to examine commercial sources of this natural copper-bearing...Mouawad Campus 5345 Armada Drive Carlsbad, CA 92008 USA © 2013 Gemological Institute of America All rights...from a practical indication of heat treatment to Oregon sunstone to our lead article on the Museum of London’s |  | | Journal (article/letter/editorial) | | Institute of Technology, Pasadena, California 91125, USA Abstract. Ferrous and ferric iron concentrations...is a principal factor in iron partitioning in plagioclase. EPR powder spectra show that the number of sites...+ depends on structural state rather than on plagioclase chemistry. The observed linear correspondence...all Fe 3+ is tetrahedrally coordinated in both plagioclase and disordered potassium feldspar. Microcline...Institution of Washington, Washington D.C. 20008, USA Previous optical and EPR spectroscopic studies of |  | | Journal (issue) | | considered as a definite indication. Absorption-spectrum Viewed through the normal gemmological absorptionspectroscope...quite different: at the short-wave end of the spectrum the absorption-curve shows a marked transmission...transmission maxima in the near ultraviolet region of the spectrum. The transmission ends at 210 nm and 270 nm respectively...demonstrated, on the basis of a study of its infrared spectrum, that the structure is better represented by the...ruby-red to co pale brownish-orange. The absorption spectrum shows faint chromium lines. Between crossed polars |  | | Journal (issue) | | OREGON GEOLOGY published by the Oregon Department of Geology and Mineral Industries VOLUME 52, NUMBER...NUMBER 6 NOVEMBER 1990 OREGON GEOLOGY OIL AND GAS NEWS (ISSN 0164-3304) VOLUME 52, NUMBER 6 NOVEMBER...March. May, July, September, and November by the Oregon Department of Geology and Mineral Industries. (Volumes...Supervisor. Second class postage paid at Portland, Oregon. Subscription rates: 1 year, $6; 3 years, $15....Single issues, $2. Available back issues of Ore Bin/Oregon Geology through v. 50, no. 4, $1. Address subscription |  | | Report (issue) | | Geology of the Blue Mountains Region of Oregon, Idaho, and Washington: Petrology and Tectonic Evolution...Center, Rm. 1C402, 12201 Sunrise Valley Dr. SALT LAKE CITY, Utah Federal Bldg., Rm. 8105, 125 South State...3101 Geology of the Blue Mountains Region of Oregon, Idaho, and Washington: Petrology and Tectonic...p. cm. (Geology of the Blue Mountains region of Oregon, Idaho, and Washington) (U.S. Geological Survey...resources of the Blue Mountains region in eastern Oregon, western Idaho, and southeastern Washington. This |  | | Book (volume) | | Lachman. Photo from Van Lachman. Opposite page: Oregon sunstone beads, earrings, pendant and loose sunstones...Publications P.O. Box 13384 Los Angeles, CA 90013-0384 USA (Inquiries should be accompanied by a self-addressed...Rhodochrosite earring and photo from Timeless Gems Oregon Sunstone carving and photo from Daylan Hargrave...Metaphysical Properties of Sunstone 110 Production of Oregon Sunstone 110 Sunstone Price Factors 112 11. Moonstone...Tanzanite Foundation. 1/Exotic Gems Fig. 1.4 Oregon sunstone earrings from Rogue Gems, LLC. Photo: |  | | Report (issue) | | Miocene) (R) Tbl Tsm Layered opalite of Almaden Mine Basalt of Toe Jam Canyon (Middle Miocene) (R) ...5 miles north-northwest of the Idaho New Almaden Mine (NW ¼, NW ¼, Sec. 29, T. 11 N., R. 3 W., elevation...5 miles west-southwest of the Idaho New Almaden Mine, in the adjacent Wieser Cove Quadrangle, in the...westernmost Sucker Creek section 7 measured west of Coal Mine Gulch at Olds Ferry in the SW ½, Sec. 22, T.11.N...Sugarloaf Member generally contains abundant plagioclase phenocrysts, and is made up of flows 10 to 20 |  | | Journal (article/letter/editorial) | | 94720-4767, USA 2. Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA 3. Chemical... 7000 East Avenue (L-231), Livermore, CA 94550, USA * Corresponding author. Email addresses: mtremblay@berkeley...First, what is the kinetics of neon diffusion in plagioclase feldspars? Gourbet et al. (2012) studied three...from stepwise degassing experiments on three plagioclase feldspars. We also discuss results from a stepwise...stepwise degassing experiment on an endmember plagioclase feldspar from lunar sample 76535 (Garrick-Bethell |  | | Book | | 74101, USA Published by The American Association of Petroleum Geologists Tulsa, Oklahoma 74101, USA Copyright...ee ee Resorbed Potassium Feldspar ........... Plagioclase Feldspar with K-Feldspar QvergTrowtnowns wn aie...aie cee sees Ok eaacuiie Resorbed Plagioclase Feldspar........... ASLaySeniesa rede temas Senshi k Ae...scanning electron microscope (20 KV). The EDX spectrum for that mineral is located on the opposite page...cases (hornblende, magnetite, etc.), only an EDX spectrum and one SEM micrograph are included. These individual |  | | Journal (issue) | | Smith Sunstone Labradorite from the Ponderosa Mine, Oregon Christopher L. Johnston, Mickey E. Gunter, and...largest producer of diamonds in 1990, t h e Argyle mine in Western Australia (36 million carats), fine gem-quality...et al., 1991). If we consider only the Kimberley mine ("Big Hole") as an example, and take into account...calculating the volume of rock removed from the Kimberley mine (the "Big Hole") in Kimberley, South Africa, the...Gunter, and Charles R. Knowles 1 n 1985, the Oregon legislature named the gem variety of labradorite |  | | Journal (issue) | | & GEMOLOGY SPRING 2011 3 NOSY BE 4 km 0 N MINE AREA Ambato MADAGASCAR LLIN S TA C RY TA R Y...mb an ja ~1 0k m n Demantoid Antetezambato mine Figure 2. The Antetezambato garnet deposit is located...located at 575 and 610 nm, clearly visible in the spectrum of the green sample (figure 15, inset); and a...UV wavelengths, evident in the brown sample’s spectrum, is the main cause of its coloration. This absorption...Peaks at 3610, 3581, and 3560 cm −1 in the mid-IR spectrum (reflectance mode) of Antetezambato andradite |  | | Book (edition) | | Corporate Drive, Suite 400, Burlington MA 01803, USA First published 1962 Second edition 1970 Third edition...Canada, Germany, Thailand, Vietnam, the UK and the USA, making this a truly international collaboration...First Edition For two decades, an earlier work of mine – Practical Gemmology – has proved a useful elementary...wood have been replaced by precious opal; in the USA, the woody cell structures of quite large trees have...and in the extensive deposits in the south-western USA, copper sulphides in trachytes (alkaline volcanic |  | | Journal (issue) | | to the c-axis. The sample shows an absorption spectrum which consists of the absorption bands of Cr 3+...superimposed on a strong aquamarine component. This spectrum is consistent with spectra reported for other...examination with the Raman microprobe showed only the spectrum of the beryl host. According to the orientation... 72 65 Aventurescent oligoclase feldspar from Oregon, USA Dr Ulrich Henn German Gemmological Association...Abstract: Transparent oligoclase feldspars from Oregon, USA are described. They contain euhedral hematite |  | | Journal (article/letter/editorial) | | 227 Almandine, Norway, pseudomorphous after plagioclase in a metadolerite dyke, anal., formation, ~27...193; anal. by, 195 Aureole of Nahant Gabbro, Mass., USA, chemical mineralogy of, anal., paragenesis, metamorphism...generation of the kimberlite carbonatite alkaline magma spectrum, 695; and see PRICE (W. F.), 675 BAIN (D. C.)...IOO5 Barbosalite, Australia, descr., opt., IR spectrum, anal., formation, 5o5 BARMCOAT (A. C.), and O'HARA...OAKLEY (P. J.), Almandine pseudomorphous after plagioclase in a metadolerite dyke from the Jotunheim, Norway |  | | Journal (issue) | | Industry Background image: Miners at the Pala Chief Mine, San Diego Country, California, circa 1903. On the...They are Found zite (201 cts) is from the Oceanview Mine in Southern California; the 0.72-ct benitoite (left...Dallas Gem Mine area, San America’s Royal Gems – Montana and Yogo Sapphires Benito County, California;...Gem Mountain Mine, GranTantalizing Turquoise ite Country, Montana. Photos of gemstones Oregon Sunstone –...Rare and Beautiful American Gemstone and original mine image by Mark Mauthner. Red Beryl – A Very Rare |  | | Journal (issue) | | 401 FEATURE ARTICLES 400 A Canary in the Ruby Mine: Low-Temperature Heat Treatment Experiments on Burmese...Fluorescence Characteristics of Two Copper-Diffused Plagioclase Feldspars: Labradorite and Andesine Qingchao...Mouawad Campus 5345 Armada Drive Carlsbad, CA 92008 USA © 2022 Gemological Institute of America All rights...2022 399 FEATURE ARTICLES A CANARY IN THE RUBY MINE: LOW-TEMPERATURE HEAT TREATMENT EXPERIMENTS ON BURMESE...gases such as carbon monoxide could build up in a mine, causing illness or even death. To prevent this |  | | Journal (issue) | | OREGON GEOLOG Y Oregon Department of Geology and Mineral Industries Volume 63, Number 3, Summer 2001...Imbler fish fossils, Grande Ronde Valley, Union County Statewide Mined Land Reclamation annual awards...new publishing format for Oregon Geology This is the last issue of Oregon Geology you receive in the...hand. To a large extent, that’s why we publish Oregon Geology. It is an avenue to disseminate information...at a point where we must make major changes to Oregon Geology to allow it to survive. We’ve already made |  | | Journal (issue) | | OREGON GEOLOGY published by the Oregon Department of Geology and Mineral Industries VOLUME 49, NUMBER...NUMBER 9 SEPTEMBER 1987 OREGON GEOLOGY OIL AND GAS NEWS (ISSN 0164-3304) VOLUME 49, NUMBER 9 AReo successful...Mist SEPTEMBER 1987 Published monthly by the Oregon Department of Geology and Mineral Industries (Volumes...Wilson sandstone. ARCO next drilled the Columbia County 11-34-65 to a total depth of 1,950 ft and has also...program. The next well to be drilled is the Columbia County 31-17-65, permitted to a 7,OOO-ft depth, a relatively |  | | Book (chapter) | | yellow color of sanidine, orthoclase and calcic plagioclase, the blue to green colors of amazonite, and the...the blue-green color of sodic plagioclase. Inclusions create a wide variety of colors: pink, brick-red...not absorb light in the visible portion of the spectrum and is, therefore, colorless. The onset of absorption...yellow color in sanidine, orthoclase and calcic plagioclase. In the potassium feldspars substitution is...ferrous exist in yellow labradorite from Lake County, Oregon, with ^0.4 wt % FeO (c/. the spectra of |  | | Journal (article/letter/editorial) | | California Institute of Technology, Pasadena, CA 91125, USA 2 Present address: Geophysical Laboratory, Carnegie...Institution of Washington, Washington, DC 20008, USA Abstract. Radiation-induced smoky color and associated...0 H20 ~ ND 1,658 Microcline 13757 Elizabeth R Mine, Calif. Or94Ab 6 0.003 None 28.4 M R 900 ° C...Keivy Pegmarite, Kola Peninsula, USSR Or96Ab 4 Lake George, Colorado Or96Ab 4 0.015 0.03 0.04 _...ND OH ND 0 ND 0 ND Labradorite 13761 Lake County, Oregon OrlAb33An66 0.31 None 11.28 M R Yellow |  | Bawiec, Walter J., Abrams, Gerda A., Finn, Carol Ann, Pitkin, James A., Ryder, Jean L., Smith, Steven M., Theobald, Paul K., Meulen, Vander, Dean, B., Walker, George W. (1990) Assessment of the mineral resources for the Adel 1 degree by 2 degrees quadrangle, Oregon. Open-File Report Vol. 1990 (89-177) US Geological Survey doi:10.3133/ofr89177 | Report (issue) | | RESOURCES FOR THE ADEL 1° x 2° QUADRANGLE, OREGON OREGON Document prepared by Walter J. Bawiec^ Gerda...studies, Adel quadrangle, Oregon. Tectonic sketch map of the Adel quadrangle, Oregon. Composition of an oblique...R-mode model for soils from the Adel quadrangle, Oregon. Relationship of copper to factor I scores for...for 1,230 soil samples from the Adel quadrangle, Oregon. The distribution of zinc in relation to factor...for 1,230 soil samples from the Adel quadrangle, Oregon. Frequency distribution of factor I scores for |  | | Journal (article/letter/editorial) | | alkali feldspars, and for the first time, eight plagioclase samples. To accurately measure structural H concentration...similar to the OH bands found in quartz. The other plagioclase samples used in the IR calibration have broad...indicative of structural OH. The OH vector in plagioclase is preferentially aligned parallel to the crystallographic...axis. The concentration of structural OH in the plagioclase samples ranges from 210–510 ppm H2O by weight...structural H determined from NMR (OH and H2O) for plagioclase and alkali feldspars. The integral absorption |  | | Journal (issue) | | OREGON GEOLOGY published by the Oregon Department of Geology and Mineral Industries JANUARY 1986 VOLUME...~/#>• . ..r, :.'. .' ' . ,.~... .... "- , , OREGON GEOLOGY (ISSN 0164-3304) JANUARY 1986 VOLUME...VOLUME 48. NUMBER 1 Published monthly by the Oregon Department of Geology and Mineral Industries (Volumes...Supervisor Second class postage paid at Portland, Oregon. SUbscription rates: I year, $6; 3 years, $15....SUbscription orders, renewals, and changes of address to Oregon Geology, 910 State Office Building, Portland, OR |  | | Journal (issue) | | OREGON GEOLOGY published by the Oregon Department of Geology and Mineral Industries VOLUME 46, NUMBER...NUMBER 11 NOVEMBER 1984 OREGON GEOLOGY (ISSN 0164-3304) VOLUME 46, NUMBER 11 NOVEMBER 1984 OIL AND GAS...GAS NEWS Columbia County - Mist Gas Field Governing Board Donald A. Haagensen. Chairman . . . . . ..... . . . . . . . . . .. Donald A. Hull Douglas County Deputy State Geologist. . . . . . . . . . . ....Brooks, Resident Geologist Lane County Published monthly by the Oregon Department of Geology and Minerai |
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