Second occurrence of the new mineral cobaltlotharmeyerite Ca (Co, Fe, Ni)2 (AsO4)2 (OH,H2O)2.

被引：0
|
作者：
Sarp, H [1 ]
Favreau, G [1 ]
机构：
[1] Museum Nat Hist, Dept Mineral, CH-1211 Geneva 6, Switzerland
来源：
ARCHIVES DES SCIENCES | 2000年 / 53卷 / 01期
关键词：
cobaltlotharmeyerite; second occurrence; Bou Azzer Mine; Maroc;
D O I：
暂无
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Second occurrence of cobaltrotharmeyerite is discovered at Bou Azzer Mine, Maroc. It is associated with roselite, roselite-beta, dolomite and quartz. The acicular crystals and lamellar curved crystals form respectivly spherules or aggregates. The color is orange-brown. A chemical analysis was carried out by means of electron microprobe: CoO 15,94. CaO 12,60; NiO 3,36; MgO 0,72; Fe2O3 11,97, As2O5 49,02; H2O (from the ideal formula) 6,39. The mineral is monoclinic, with a = 9,045(7), b = 6, 233(3), c = 7, 427(4) Angstrom, beta = 115,36(5)degrees space group C2/m, V = 378,3 Angstrom(3) and Z = 2. The density is 4,2 (meas.) and 4,09 g/cm(3) (calc.). The strongest lines in the X-ray diffraction pattern are [din Angstrom, (hkl), Ivis.]: 4,96 (110)(40), 4,600 ((1) over bar 11)(30), 3,402 ((2) over bar 02)(90), 3,188 ((1) over bar 12)(80), 2,971 (201)(100), 2,830 (021)(40), 2,712 (311)(40), 2,551 (221)(70).
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页码：49 / 54
页数：6
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