Abstract
The new mineral chalcothallite, CU3TlS2 was discovered in a hydrothermal ussingite vein in poikilitic sodalite syenite (naujaite) in the Ilímaussaq intrusion, South Greenland. The new mineral is associated with ussingite, analcime, sodalite, epistolite and chkalovite. The mineral forms lamellar aggregates. The colour is lead grey to iron black with metallic lustre. There are three mutually perpendicular cleavages. The specific gravity is 6.6, the hardness is 61-90 kg/mm2. The chemical composition is: TI-38.07, Cu- 40.58, Ag-0.19, Pb-0.13, Fe - 3.79, S -12.06, Sb - 3,93, insoluble 1.52; total 100.27. The d-values of the strongest lines of the x-ray powder diagram are: 3.93, 3.75, 3.49, 3.07, 2.48, 2.32, 2.19, 1.930. Like chalcocite, chalcothallite is easily subject to transformation and recrystallization. There are inclusions of native silver, chalcocite, vrbaite and avicennite (?).
Highlights
In the summer of 1964, while examining the nepheline sodalite syenite massif of Ilimaussaq, an unknown ore mineral was discovered by E
The detailed examination of the samples carried out at IMGRE revealed that this mineral is a new copper-thallium sulphide with the approximate formula CuaTIS2 The mineral is named chalcothallite after its chemical composition
The name chalcothallite has been approved by the Soviet-Russian and the I.M.A
Summary
In the summer of 1964, while examining the nepheline sodalite syenite massif of Ilimaussaq, an unknown ore mineral was discovered by E. Chalcothallite is subject to transformation and recrystallization. The detailed examination of the samples carried out at IMGRE revealed that this mineral is a new copper-thallium sulphide with the approximate formula CuaTIS2 The mineral is named chalcothallite after its chemical composition. The mineral occurs in limited amounts in veins of ussingite intersecting poikilitic sodalite syenite (naujaite).
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