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Geology Mineralogy fields Okayama University Year 2000 Native gold from Mikawa mine, Niigata Prefecture, Japan Junji Yamakawa Dr. ∗ Mitsuo Tanabe† Kazumasa Shimada‡ Chiyoko Henmi∗∗ ∗Okayama University, [email protected] †Okayama Mineral and Fossil club ‡Okayama Mineral and Fossil club ∗∗Okayama University This paper is posted at [email protected] : Okayama University Digital Information Repository. I. 序 三川鉱山は新潟県東蒲原郡三川村に位置する鉱山 である.二次鉱物の産出が豊富であり,方鉛鉱,閃 亜鉛鉱,黄銅鉱,黄鉄鉱,赤鉄鉱石英(紫水晶)、ド ロマイト,菱鉄鉱,方解石,重晶石,水亜鉛銅鉱, 孔雀石,藍銅鉱,白鉛鉱,硫酸鉛鉱,青鉛鉱,ブロ シャン銅鉱,珪孔雀石,硫黄,赤銅鉱,尾去沢石, ビーバー石,銅アルミナ石,菱亜鉛鉱,亜鉛孔雀石, 炭酸青針銅鉱,ラング石,シューレンベルグ石,レ ッドヒル石,青針銅鉱などが産出する.今回,筆者 らは三川鉱山で自然金の単結晶を見い出したのでこ れを報告する. II. 地質の概要 三川鉱山は足尾帯および緑色凝灰岩帯に属してい る,白亜紀から中新世にかけて形成されたと推定さ れているVein型の熱水鉱床である.主に鹿瀬層に属 する花崗岩と津川層に属する変朽安山岩によって構 成されている.鉱床の規模は約5,000 m × 1,000 m × 8,000 mと推定されている.Cu, ZnおよびAgを目的に 採掘された鉱山である(Sato, 1980). III. 産状 自然金は変朽安山岩中の晶洞内に存在しており, 石英と共に産出している。黄金色不透明で金属光沢 *1 岡山大学理学部地球科学科.〒700-8530 岡山市津島中3丁目1-1. Department of Earth Science, Faculty of Science, Okayama University, Okayama 700-8530, Japan. *2 岡山鉱物化石研究会.〒700-0944 岡山市泉田260. Okayama Mineral and Fossil club, Izumida 260, Okayama City, Okayama 700-0944, Japan. Native gold was found at Mikawa mine, Niigata Prefecture, Japan. The mineral was associated with quartz in a druse within quartz-vein in propyrite. The crystals were formed in filiform, reticulated and dendritic shapes with about 1 mm length with 0.1 mm width and 0.05 mm thickness. Very malleable and ductile, opaque and yellow with metallic luster. Qualitative and semi-quantitative analyses were performed by the wavelength dispersive EPMA. Quantitatively, the crystals contained Au, Ag and Hg. Semi-quantitative analyses were executed with ZAF correction algorithm. The results showed that these specimens had a average chemical composition Au0.77Ag0.11Hg0.12. This specimen was archived at our site with a collection number ESO-M01001. Keywords: Nativ

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