Ramsbeckite from the Hirao mine at Minoo, Osaka, Japan

Ramsbeckite from the Hirao mine at Minoo, Osaka, Japan
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产自日本大阪箕面平尾矿的斜角石

DOI：
10.2465/jmps.99.19
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Masao Shirakami
Masao Shirakami
中科院分区：
--
文献类型：
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作者：
M. Ohnishi;S. Kobayashi;I. Kusachi;J. Yamakawa;Masao Shirakami

文献摘要

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Ramsbeckite是在日本大坂Minoo的Hirao矿的蚀变页岩中发现的一种脉状矿物。它以直径达0.5 mm的自形粒状晶体的集合体出现，与闪锌矿、黄铜矿、菱锌矿、绿铜矿、无定形二氧化锰、舒伦铍石、水绿铜矿、蛇纹铜矿、褐铁矿和一种未鉴定的矿物共生。EPMA和CHNS/O分析仪给出了经验式（Cu9.380Zn5.542Ni0.034Co0.027Fe0.020Mn0.013）<$15.016 [（SO 4）3.871（CO 3）0.166]<$4.037（OH）21.958·6.06H2O（以O = 44为基础）。晶胞参数为a = 16.106（3），B = 15.568（2），c = 7.109（1）A，β = 90.23（1）°，Z = 2。该矿物为负二轴光学晶体，折射率α = 1.676，β = 1.704，γ = 1.707，2 VX（calc）= 37.8°。维氏显微硬度为162（144-182）kg/mm 2（10 g载荷），莫氏硬度为3.5。测得的密度为3.36 g/cm 3。平尾矿的斜方闪石很可能是从含铜和锌的流体中结晶出来的。
Ramsbeckite was found as a vein forming mineral in altered shale at the Hirao mine, Minoo, Osaka, Japan. It occurred as aggregates of euhedral granular crystals up to 0.5 mm across, in association with sphalerite, chalcopyrite, smithsonite, aurichalcite, amorphous manganese dioxide, schulenbergite, brochantite, serpierite, limonite and an unidentified mineral. It was emerald green to blue-green in color with a vitreous luster in hand specimen. An EPMA and CHNS/O analyzer gave the empirical formula (Cu9.380Zn5.542Ni0.034Co0.027Fe0.020Mn0.013)Σ15.016[(SO4)3.871(CO3)0.166]Σ4.037(OH)21.958·6.06H2O on the basis of O = 44. The unit cell parameters were a = 16.106 (3), b = 15.568 (2), c = 7.109 (1) A, β = 90.23 (1)°, and Z = 2. The mineral was optically biaxial negative with refractive indices α = 1.676, β = 1.704 and γ = 1.707, and 2VX(calc) = 37.8°. The Vickers microhardness was 162 (144-182) kg/mm2 (10 g load), and the Mohs hardness was 3.5. The measured density was 3.36 g/cm3. It is likely that ramsbeckite at the Hirao mine crystallized from Cu and Zn-bearing fluids.