Eulytine
Eulytine (German: Eulytin from Ancient Greek: εΰλυτος, fusible, easily dissolved) or bismuth blende (obsolete) — one of the rarest minerals in nature, the composition is bismuth silicate with the calculation formula Bi4(SiO4)3 or Bi4Si3O12. The mineral forms isometric cubic crystals up to 2 mm in size, the supporting form of which is a tetrahedron or tristetrahedron. Among the varieties, there are also often concentric, fibrous or spherical aggregates of a very impressive appearance, which were previously called agricolites.
| Eulytine | |
|---|---|
| General | |
| Category | Silicate mineral |
| Formula (repeating unit) | Bi4(SiO4)3 or Bi4Si3O12 |
| IMA symbol | Eul |
| Strunz classification | 9.AD.40 |
| Crystal system | Cubic |
| Crystal class | Silicate |
| Identification | |
| Color | orange or orange-brown to red-brown, less often bright green or colorless |
| Crystal habit | generally bright is appearance |
| Twinning | penetrations twins on {001}. |
| Cleavage | imperfect to fair {110} |
| Fracture | irregular to uneven, vaguely conchoidal, the mineral is brittle |
| Tenacity | brittle |
| Mohs scale hardness | 4.5 |
| Luster | diamond to glass |
| Streak | white to grayish yellow |
| Diaphaneity | transparent to opaque |
| Density | 6.1–6.6 (calculated) |
| Pleochroism | non-pleochroic |
Eulitine is a secondary mineral, a product of the oxidation of bismuth and its compounds.: 303
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