Morimoto, "Tetrahedrites stability relations in the Cu-Fe-Sb-S system," American Mineralogist, vol.
Sulphosalt group compounds such as chalcostibite (CuSb[S.sub.2]), famatinite ([Cu.sub.3]Sb[S.sub.4]), and tetrahedrite ([Cu.sub.12][Sb.sub.4][S.sub.13]) are part of a relatively new class of material containing antimony.
Donald Morelli, a professor of chemical engineering and materials science at Michigan State University, led the team which developed the material based on natural minerals known as tetrahedrites.
"The mineral family that they mimic is one of the most abundant minerals of this type on Earth - tetrahedrites.
(I didn't even know Butte had world-class rhodochrosites, tetrahedrites
and chalcopy-rites, and 3-inch covellite crystals!).
July 25: In the Tetrahedrite Drift, the best tetrahedrites yet found: big plates with 1 1/2-inch lustrous crystals, come from the Museum Pocket.
There are bright tetrahedrites to 3/8-inch and bright druses of chalcopyrite and sphalerite, but no fluorite.
The main Casapalca mine has furnished good to excellent specimens of quartz, bournonite, galena, sphalerite, pyrite, calcite, manganoan calcite and tetrahedrite. The tetrahedrites occur in crystals to over 8 cm in size; they are some of Peru's largest and, it can be argued, some of Peru's best.
The dominant mineral assemblage at the margins of the district is sphalerite, galena, calcite and Ag-bearing tetrahedrite. Generally the arsenic content of the ores decreases away from the central part of the district.
Except for the radically different morphology, these suggest the old chalcopyrite-coated tetrahedrites
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Luzonite forms tetragonal bipyramidal crystals to 1 cm covered by small tetrahedrite
crystals; it has also been identified as tabular reddish violet metallic crystals to 4 cm with cores of enargite.