The phase relations of tetrahedrite have been studied in the Cu-Sb-S ternary system below 400°C. Tetrahedrite is stable in a wide solid solution range above 95°C with the composition of Cu12+XSb4+yS13 where 0.11 ⩽ X ⩽ 1.77 and 0.03 ⩽ Y ⩽ 0.30.

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First page of Composition variation and polymorphism of tetrahedrite in the Cu-Sb-s system below 400°C
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