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＜departmental bulletin paper＞
Ullmannite from the Taishu-Shigekuma mine, Tsushima Island, Japan
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| Abstract | Ullmannite has been found in silver-lead-zinc veins from the Taishu-Shigekuma mine. The mineral shows two modes of occurrence in terms of mineral assemblage; partly as a veinlet cutting siderite and s...phalerite, and mainly as relicts of myrmekite consisting of sphalerite and ullmannite in argentian tetrahedrite and chalcopyrite. Ullmannite is from 2 to 10 microns across, but rarely attains to 40 microns. In reflected light, the mineral is white and isotropic. Its microhardness values range from 453 to 515 with a load of 10g. Electron microprobe anaysis of ullmannite crystals shows that they are from (Ni_0.95 Co_0.03Zn_0.01) Sb_1.01S_0.98 to (Ni_0.96Co_0.02Fe_0.02Zn_0.01) Sb_1.02S_0.97 1) 対州しげくま鉱山のウルマン鉱は，鉱体の上下にわたって比較的一様に分布する．特に含銀四面安銅鉱中に多く認められ，径2~10ミクロン（稀20～40ミクロン）で交代残昂として散在する．また，菱鉄鉱，閃亜鉛鉱を切る微細脈として，あるいは黄銅鉱中の交代残晶として，少量認められる．2) ウルマン鉱は，鏡下では，白色で，方鉛鉱よりやや高い反射能を示す．多色性，異方性は認められない．微小硬度は，VHN_10.= 453～515であった．3) EPMAによる分析の結果， その組成はほぼ理想式に近く, (Ni_0.94～0.96 Co_0.01～0.03 Fe_0.02 Zn_0.01) Sb_1.00～1.04 S_0.96～0.99show more |
| Table of Contents | はじめに 鉱床の概要 産状と共生 反射顕微鏡下の性質 化学組成 考察 |
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| Created Date | 2021.11.10 |
| Modified Date | 2022.06.20 |