La sabatierite, un nouveau séléniure de cuivre et de thallium

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Abstract
Sabatierite, Cu6TlSe4, is orthorhombic (indexing of powder pattern) with a = 3.986 ; b = 5.624 ; c = 9.778 Å ; Z = 1 ; the calculated specific gravity is 6.78 g/cm3. The strongest lines in the powder pattern are : 3.987 (5), 3.089 (10), 2.706 (7), 2.525 (5), 2.445 (6), 1.991 (7), 1.847 (6), 1-673 (5) Å. Average composition from microprobe analyses : Cu 42.71 ; T1 22.44 ; Se 34.57, total 99.72 %, giving a formula Cu6.06Tl0.99Se3.95. In reflected light it is bluish gray in colour with slightly cream tint. Reflectivity values : 33.2-31.0 (420) ; 32.2-29.5 (500) ; 30.6-27.9 (540) ; 27.2-25.3 (600) ; 21.6-21.3 (700 nm). Strongly anisotropic with undulatory extinction. Microhardness (Vickers) : 54 ± 7 kg/mm2. Found in Bukov ore deposit, Moravia, Czechoslovakia, associated with crookesite and berzelianite. Extremely rare. The name is for Germain Sabatier.

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