 | | Journal (article/letter/editorial) | | 295‑302, 1973 福島県宝坂産蛋 白石 について* OPAL FROM HOSAKA, FUKUSHIMA PREFECTURE, JAPAN 堤 坂 本 貞 夫(Sadao Tsutsumi)**...well known that opal occurs from Hosaka, Fukushima Pref., northeastern Japan . The opal is found as crusts...shows a colour play of precious opal. The section of nodular massive opal shows a distinct banded structure...chalcedony , while milky white layers are occupied by opal. In addition, it was found that montmorillonite...are associated with opal. The X-ray powder diffraction patterns of opal from Hosaka are divided into three |  | | Journal (article/letter/editorial) | | oAn4.3) ~a spherufites from two Iocal~ities in Japan consist of triciini¢ anarthoclase showing fine cro~;s-hatched...Faculty of Science, Tohoku University, Sendai 980, Japan; 3rd February, 1983. Spheralites consisting: of...textures in weld-, ed tuff and rhyo|ite obsidian from Japan, and found the spherulites to be composed of sanidine...Shirataki, Wadatoge, Haneyama and other localities, Japan. Sphe~mlites originate at fine cracks in welded...cracks are not observable ifi the specimens from Hosaka and SMrataki. Optical wicroscopic rings, socalled | | | Journal (article/letter/editorial) | | TEXTUREAND MINERALS IN OPALFROMHOSAKA, FUKUSHIMA PREFECTURE, JAPAN 秋 月 島 田昱 瑞 彦(Mizuhiko 郎(Ikuro Akizuki)*...Precious and common opals from the Hosaka mine, Fukushima Prefecture, Japan were studied by means of optical...transmission electron microscopies. The precious opal showing weak play of color of red, green and violet...regular. The origin of the play of color in this opal cannot be explained by diffraction of light in regular...silica spheres. Commom opal, whose x-ray diffraction pattern corresponds to opal-CT (Jones et al. 1971) |  | | Journal (article/letter/editorial) | | spectroscopy to characterize the Þnescale structure of opal and to better distinguish opals showing similar...intermediate-range scale the atomic structure of opal lepispheres is closer to the framework topology...tridymite than to that of cristobalite. Keywords: Opal, Raman spectroscopy, lepispheres, cristobalite,...amorphous opal (opal-A); disordered cristobalite with signiÞcant tridymitic stacking (opal-CT); and more...cristobalite with minor tridymitic stacking (opal-C). Opal-CT and opal-C are considered as microcrystalline varieties |  | | Journal (article/letter/editorial) | | formed via a series of transformations from opal-A to opal-CT to polycrystalline quartz (Mizutani, 1970)...Table 1. Experimental data. + starting material is opal-A * solution/solid mass ratio = 1 **Wt % of quartz...crystal growth rate (e.g. Laudise, 1959 and 1987; Hosaka & Taki, 1989a and b). However, there have only...used in the experiments is a natural diatomite (opal-A) from the Monterey formation, California. The...five opal + quartz + calcite mixtures. Each mixture contains 50 wt.% calcite and 50 wt. % opal + quartz; |  | | Journal (issue) | | (Texture and minerals in opal from Hosaka, Fukushima Prefecture, Japan.) J.Geol.Soc. Japan, 74, 274-9, 9 figs...and common opal from the Hosaka mine were studied optically and by TEM. The precious opal consists of...amorphous silica spheres 400-500 A in diameter. Common opal contains acicular crystals of diameter ~200 A, but...1980; (e) Rosaopal von Idaho (USA). (Rose-coloured opal from Idaho, U.S.A.) Id., 193, bibl., 1980; (f) Granate... Definite pleochroism. (e) Some time ago a pink opal was offered on the market, but proved to be palygorskite |  | | Journal (article/letter/editorial) | | mmol/kg, and opal was precipitated on the walls of the capsules above the solution (the opal was transformed...(trigonal) quartz (hereafter referred to as quartz) and opal are spread most widely (Dana et al., 1962; Dove...1962). Opal occurs in a number of modifications, with the most widely spread noncrystalline opal-A, microcrystalline...microcrystalline opal-C (cristobalite), and opal-CT (cristobalite–tridymite). At relatively low temperatures...usually precipitates from solutions in the form of opal-A (Dana et al., 1962). This process occurs in marine |  | | Report (issue) | | mineral col lector, was born in Kanazawa, Ishikawa Prefecture, on August 30, 1874. Soon after his graduation...a mining engineer at the Arakawa Mine, Akita Prefecture. In 1909, he was promoted to Director of the...of the Director of the Yoshioka Mine, Okayama Prefecture, for about seven years altogether. He returned...technology in the first half of this century in Japan. He retired from the Advisory Board of the Mitsu...such volumes as " Beiträge zur Mineralogie von. Japan ", Neue Folge I and II (T. Ito, 1937), " Japanese |  | | Journal (issue) | | Opalite triplets - new new imitations imitations of of opal Opalite KenScarratt, Scarratt, Robert C. Kammerling...the properof the imitation imitation opal known as 'Opalite' or 'Opal of of six Opalite Opalite triplets...was limited limited to the Key words: Mosaic, Opal, Opal Essence, Opalite, GemoLite refractometer, GemoLite...illumination illumination the introduction of of a new opal simulant. This simtechniques were used including...incident lighting through an optical fibre. fibre. of opal in which be described as a plastic imitation of |  | | Journal (issue) | | mentioned, these products have to be designated as opal imitations, rather than synthetic opals. In two...synthetic label, and have to be designated as black opal imitations. INTRODUCTION Since 1974, different...to fire opal with a play of colours, was also offered under the designation 'created fire opal', or 'created...'created honey opal'. Different possibilities for the production of opals have been discussed by several...last step in the production process of synthetic opal is noted to be highly problematic, and a method |  | | Journal (issue) | | 633 1.655 1.660 1.662 1.660 c Species Fluorite Opal Paste Petalite Quartz Synthetic quartz lohte Beryllonite...Ph.D., F.G.A.*, F.G.A.*, Masahiro Masahiro Hosaka, Hosaka, Ph.D., Ph.D., F.G.A.* Takéshi F.G.A.* and...Tokojicho, 1955-1, 1955-1, Kofu, Kofu, 400, 400, Japan. Japan. †A. tA oChikayama Chikayama Gem Gem Laboratory...Ogikubo, 1-36-16, 1-36-16, Tokyo, Tokyo, 167, 167, Japan. Japan. Abstract Abstract from Santa Sama Terezinha...SANDEMAN, D., 1986. Boulder opal triplet imitating natural solid boulder opal. Australian Gemmologist, 16 |  | | Journal (issue) | | Gemology, contact GIA Japan, Okachimachi Cy Bldg., 5-15-14 Ueno, Taitoku, Tokyo 110, Japan. Our Canadian goods...1985; Bukin et al., 1986; Schmetzer, 1988, 1990; Hosaka, 1990; Koivula et al., 1996). Hydrothermally grown...emeralds—that is, 0.70 to 1.53 kbar, as summarized by Hosaka (1990)—but in a similar temperature range of 500°–...emeralds (see Pough, 1965; Lebedev et al., 1986; Hosaka, 1990; Sosso and Piacenza, 1995; Sechos, 1997)...(Flanigen et al., 1967; Galia, 1972; Sunagwa, 1982; Hosaka, 1990). The tiny birefringent crystals have a refractive |  | | Journal (issue) | | thorium. Introduction The recent publication of Hosaka, Tubokawa, Hatushika and Yamashita on red beryl...traces published by Shigley and Foord (1984) and by Hosaka et al. (1993), although the absorption peaks of...content - 2.8 per cent compared with 1.3 per cent (Hosaka et al.) and 1.5 1.8 per cent (Shigley and Foord)...assistance with micrprobe analyses. References Hosaka, M , Tubokawa, K., Hatushika, T., Yamashita, T...T of the phase transition. R.A.H. Precious layer opal with a complex sedimentary formation process as |  | | Journal (issue) | | Gemology, contact GIA Japan, Okachimachi Cy Bldg., 5-15-14 Ueno, Taitoku, Tokyo 110, Japan. Our Canadian goods...particularly as it is affected by the U.S. and Japan, is the main determining factor in how rapidly newly...use of less-expensive diamonds) in the U.S. and Japan, which made it possible for the Indian industry... p.16) 1979: Johnson et al. (1989) 1980–1995: “Japan holds the key” (1997, p. 42). Note: These data are...case. One compilation published for 1992 (“U.S., Japan fuel diamond jewelry market,” 1994) is typical of |  | | Journal (issue) | | Gemm., Gemm., 1988,21,2 1988, 21, 2 Synthetic opal Alan Hodgkinson, FGA, FGA, Dia.Dip. Dia.Dip. Alan...was no 'chicken wire' as with the Gilson synthetic opal. The material gained some ground until identified...material is apparently synthesized synthesized in Japan, and it is helpful helpful to note that when examined...mm oval cabochons. A support support test for the opal material is that ultraviolet ultraviolet long-wave...Gemmological Association Fig. 1. I. Synthetic opal examined examined by immersion immersion microscope |  | | Journal (issue) | | a n a m e which is properly given to a type of opal. T h e density of imitation pearls has received...the answer to the 'packed spheres' structure of opal as shown by electron-microscopy. As far as the writer...'jade' substitute are mentioned. T h e story of an opal doublet and a remarkable natural sapphire with an...or simple. M.O'D. MCLOUGHLIN (D.). Gemmology in Japan. Australian Gemmologist, 1972, 11, 7, 18-19. An...public. TAYLOR (J. S.). The story of White Cliffs opal field. Gems & Gemology, 1971, X I I I , 11, 334-343 |  | | Journal (issue) | | parent rock. Chalcedony, Chrysoprase and common opal are all reported as common capping materials over...favourably to the NIR characterization of water in opal (Langer and Flörke, 1974) and recorded NIR spectra...black opal from Australia, transparent yellow opal from Idaho and transparent red-orange opal from Mexico...materials - chrome chalcedony, Chrysoprase and chrome opal all occur within latérite horizons overlying serpentinite...G., 1985. The nature of water in chalcedony and opal-C from Brazilian agate geodes. Phys. Gem. Minerals |  | | Journal (issue) | | particularly synthetic rubies, are now made in U.S.A. and Japan. Among many American manufacturers Chatham is credited...a similar colour variety of sapphire is made in Japan by Kyocera International Inc., in Kyoto, and marketed...varieties of synthetic corundum made in America and Japan are extensively investigated and compared with the...16th to 27th October, 1984, Mr O'Donoghue visited Japan and gave lectures on modern developments in synthetic...audiences of the Gemmological Information Centre of Japan in Tokyo, Fukuoka and Osaka. He also visited the |  | | Journal (issue) | | Notes on recent synthetics and the blackening of opal, J.Gemm., XII, 309-11. Scala, C. M., and Hutton...grading notation. M.O'D. BALL (R. A.). Common opal andpotch opal. Aust.Gemmol., 14, 11, 305-10, 7 figs, 1982... Discusses the difference between potch opal and common opal. The terms are often used synonymously,...precious opal and differs from common opal in its structure quite substantially. Common opal does not...BALL (R. A.). Honey opal. Aust.Gemmol., 14,12, 324-5,2 figs, 1982. Deals with opal of this colour and |  | | Journal (issue) | | hydrothermal synthetic emerald, plastic impregnated opal, synthetic diamond and the answer to those treated...to orange-brown quartz is recently described by Hosaka and Taki (1983). The hydrothermal growth was performed...AMETHYST Synthetic amethysts commercially grown in Japan and USSR were annealed at various temperatures....country of production USA, USSR Japan, USSR Japan, USSR Japan, USSR Japan colour working solution type...Y-bar seeds were used* (0001) not observed *Hosaka and Taki (1983) J. Gemm. , 1989,21 ,6 384 000 |  | | Journal (issue) | | Switzerland Abstract Transparent brownish 'iris opal' from San Luis Poto-sí interference at thin layers...et ai, 19852). In gener al, it can be said that opal can be formed at low Introduction temperatures from...mentioned in a gemmological publica as shown in opal from some sedimentary rocks tion (Barbour, 1964)...1964), and these are the subject of from Australia. Opal can also form at higher the present study (Figure...components (Sinkankas, 1966) they were called iris opal. Leiper in the form of cristobalite and/or tridymite |  | | Journal (issue) | | with strong blue/green dichroism • Peruvian blue opal • Interesting pearls from the North American West...Chatoyant glass cabochons from China • New synthetic opal varieties • Plastic imitations of a walrus tusk...EDITORIAL REVIEW BOARD Shigeru Akamatsu Tokyo, Japan A. J. A. (Bram) Janse Perth, Australia Thomas...Gemology, contact GIA Japan, Okachimachi Cy Bldg., 5-15-14 Ueno, Taitoku, Tokyo 110, Japan. Our Canadian goods...topaz, and garnet in lithophysal (gas) cavities, or opal as veins or cavity fillings. Besides the Ruby Violet |  | | Journal (issue) | | considerably) is not done in Bangkok, but in California, Japan, and Switzerland. The donor of the crucibles mentioned...Rayner-type refractometers are also now made in Japan. The most recent developments in conventional refractometry...Chikayama, A. (1979) The existing coral industry in Japan. 17th Int. Gemm. Conf., Idar-Oberstein. Hyman, L...samples of his latest production of synthetic white opal. Of the eight samples we received, M. Gilson informed...testing is concerned the fact that a 'synthetic' opal has been plastic impregnated is not the most important |  | | Journal (issue) | | pink and violet varieties have been produced in Japan by Adachi New Industrial Ltd. of Osaka (Chikayama...entered the trade. Although it is well known that in Japan and particularly in Russia various other synthetic...UVS UVL (long wave) (short wave) colour ANICS (Japan) reddish violet pale blue 'wa termelon' 1.563 ...obtained on a number of synthetic beryls produced in Japan and Australia. The recent red beryls show strong...and Miyata, T., 1987. Synthetic gemstones from Japan. Transactions of the XXI International Gemmological |  | | Journal (issue) | | several several developed working groups groups in in Japan Japanand andin inthe theUnited United working States...Johachido District, Kisshu County, Kankyo Hodu Hodu Prefecture, North Korea (Figure (Figure 2). Moore and Araki...IIDA. Journal of the Gemmological Society of After Japan, an 21,introductory 1996, 15-19. chapter outlining...(triclinic) zones. aniSOtropic M.O'D. Feueropal von Opal Butte, Oregon, Oregon, USA. USA. G. HOLZHEY. Gemmologie...carry fillings of fire and other opals. The fire opal is arrangement of silica spheres of different different |
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Hosaka, Fukushima Prefecture, Japan