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The X-Ray Crystallography of Rosasite From Tsumeb, Namibia

Published online by Cambridge University Press:  10 January 2013

Andrew C. Roberts ,
John L. Jambor  and
Joel D. Grice
Andrew C. Roberts
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ontario, Ontario, Canada K1A 0E8
John L. Jambor
Affiliation:
CANMET, 555 Booth Street, Ottawa, Ontario, Canada K1A 0G1
Joel D. Grice
Affiliation:
Mineral Sciences Division, National Museum of Natural Sciences, 1926 Merivale Road, Ottawa, Ontario, Canada K1A 0M8
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Abstract

Crystals of green to bluish green rosasite from Tsumeb, Namibia are monoclinic, space group P21/a, with refined unit-cell parameters a = 12.873 (3), b = 9.354 (3), c = 3.156 (2) A, β = 110.36 (3)°, V = 356.3 (5) A3 and a:b:c = 1.3762:1:0.3374, with Z = 4 and Dx = 4.15 g./cm.3. Crystals are twinned by 180° rotation about a*. A fully indexed powder pattern is presented. Electron-microprobe analyses, average (wt. %): Cu 32.9, Zn 23.7; this suggests an analytical formula of (Cu1·18 Zn0·82) (CO3) (OH)2. The rosasite is optically biaxial negative, α = 1.673 (1), β = 1.796 (3), γ = 1.811 (3), 2Vx = 33 (5)° (calc. 36.4°), with X = c, Y = a* and Z = b.

Type
Research Article
Information
Powder Diffraction , Volume 1 , Issue 1 , March 1986 , pp. 56 - 57
Copyright
Copyright © Cambridge University Press 1986

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References

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