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Apachite and gilalite, two new copper silicates from Christmas, Arizona

Published online by Cambridge University Press:  05 July 2018

F. P. Cesbron  and
S. A. Williams
F. P. Cesbron
Affiliation:
Laboratoire de Minéralogie-Cristallographie, place Jussieu, 75230 Paris Cedex 05, France
S. A. Williams
Affiliation:
Box 872, Douglas, Arizona 85607, USA
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Summary

Both new species are retrograde or mesogene minerals that occur in tactites at the Christmas mine, Gila County, Arizona (USA). Gilalite is green, H = 2, D = 2.82. Biaxial (—), 2V small, α = 1.560, β = γ = 1.635. No single crystals found; strongest lines at 13.49 Å, (10); 10.97 (5); 7.786 (5). Analysis gave CuO 36.2%, MgO 2.3, CaO 3.8, MnO 0.5, SiO2 41.5, H2O 14.6, close to Cu5Si6O17·7H2O.

Apachite is blue, H = 2, D = 2.80. Biaxial (—), 2V small, α = 1.610, β = γ = 1.650. No single crystals found. Strongest lines are 12.90 Å (10); 3.168 (7); 7.663 (5). Analysis gave CuO 43.6%, FeO 0.3, MgO 1.7, CaO 1.8, SiO2 40.8, H2O 13.8, close to Cu9Si10O29·11H2O.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 329 , March 1980 , pp. 639 - 641
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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References

Eastlick, (J. T.), 1968. Ore Deposits of the United States, 1933-1961, 11, AIME, New York.Google Scholar
Perry, (D. V.), 1969. Econ. Geol. 64, 255-70.CrossRefGoogle Scholar