Kuramite
Mineral of the stannite group
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Kuramite is a mineral of the stannite group. It is named after the Kochbulak Au-Ag-Te deposit locality in the Chatkal-Kuraminskii Mountains in Uzbekistan, where it was first discovered.[1]
| Kuramite | |
|---|---|
| General | |
| Category | Sulfide |
| Formula | Cu3SnS2 |
| Crystal system | Tetragonal |
| Identification | |
| Color | Grey, Steel Grey |
| Crystal habit | Inclusions, Microscopic crystals |
| Mohs scale hardness | 5 |
| Luster | Metallic |
| Streak | Metallic |
| Density | 4.56g/cm3 |
| References | [1][2][3][4] |
Occurrence
Kuramite occurs in gold-sulfide-quartz veins as inclusions in goldfieldite, as observed in the Kochbulak deposit in Uzbekistan. It may also occur as microscopic crystals.[4]
Kuramite has also been found in the Arctic Ocean, Argentina, Chile, DR Congo, Greece, Hungary, Japan, United Kingdom, and USA.[4]
Physical properties
Kuramite's hardness on the Mohs scale is 5, and it has a density of 4.56.[2] It is an opaque steel grey color with a metallic luster and a metallic streak.
Chemical properties
X-ray powder pattern
X-ray study of Kuramite was done using the powder method, in the mineralogical laboratory of IGEM, Academy of Sciences of the USSR, by G. V. Vasova (RKO-57.3, unfiltered FeK).[1] Kuramite was found to relate to the stannite-kesterite group. The parameters of the unit cell are found to be a=5.445±0.005 Å, c=10.75±0.02 Å, c/a=1.972.
| d-spacing | Intensity |
|---|---|
| 3.13 Å | (10) |
| 1.914 Å | (8) |
| 1.640 Å | (6) |
| 1.108 Å | (4) |
| 1.244 Å | (3) |
| 2.70 Å | (2) |
| 1.044 Å | (2) |