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Tlapallite, a new mineral from Moctezuma, Sonora, Mexico

Published online by Cambridge University Press:  05 July 2018

S. A. Williams  and
Marjorie Duggan
S. A. Williams
Affiliation:
Phelps Dodge Corporation, Douglas, Arizona 85607, U.S.A.
Marjorie Duggan
Affiliation:
Phelps Dodge Corporation, Douglas, Arizona 85607, U.S.A.
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Summary

Tlapallite is a new mineral found in 1972 at the Bambollita (La Oriental) mine near Moctezuma, Sonora. Also recently found in old specimens from Tombstone, Arizona. Data for type (Mexican) material: Colour viridian green RHS-128A with pale streak, H = 3, D calc = 5·05 g/cm3. Crystals monoclinic, class unknown. Indexing based on Ito method gave a cell: a = 11·97 Å, b = 9·11, c = 15·66, β = 90 ° 36′. Strongest lines: 11·972 Å (10), 2·985 (10), 3·540 (6), 5·946 (5), 2·887 (5), 4·731 (4), 3·372 (4), 3·282 (4). Similar data obtain for Tombstone. Chemical analysis for type material yielded the formula H6Ca2Cu3(SO4)(TeO3)4,TeO6 with Te4+:Te6+ = 4:1. However, analysis of the Tombstone material indicates a more general formula H6(Ca, Pb)2(Cu, Zn)3(SO4) (TeO3)4,TeO6. The better data from this material indicate Z = 4, D calc = 5·465 vs D meas = 5·38. Characterized by extreme birefringence, α = 1·815, β = γ = 1·960; for Tombstone α = 1·955, β = γ = 2·115.

Named from the Nahua word tlapalli, meaning paint, in allusion to its mode of occurrence at the type locality.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 322 , June 1978 , pp. 183 - 186
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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References

Jones, (P. A.) and Stephen, (W. I.), 1973. The indirect spectrophotometric determination of the sulphate ion with 2-Aminoperimidine. Anal. Chim. Acta, 64, 85–92.CrossRefGoogle Scholar