Marshite
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| Marshite | |
|---|---|
| General | |
| Category | Halide mineral |
| Formula (repeating unit) | CuI |
| Strunz classification | 3.AA.05 |
| Dana classification | 9.1.7.3 |
| Crystal system | Isometric |
| Crystal class | Hextetrahedral (43m) |
| Space group | F43m |
| Unit cell | a = 6.05 Å; Z=4 |
| Identification | |
| Color | Honey-yellow, exposed to air pink-red to brick-red |
| Crystal habit | Tetrahedral crystals, cubo-octahedral, crusts |
| Twinning | On {111} |
| Cleavage | {011} perfect |
| Fracture | Conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 2.5 |
| Luster | Adamantine, greasy |
| Streak | Yellow |
| Diaphaneity | Transparent |
| Specific gravity | 5.68 |
| Density | 5.68 g/cm3 (measured), 5.71 g/cm3 (calculated) |
| Optical properties | Isotropic |
| Ultraviolet fluorescence | Dark red (SW, LW) |
| References | [1][2][3] |
Marshite (CuI) is an isometric halide mineral with occasional silver (Ag) substitution for copper (Cu).[1] The mineral’s name is derived from the person who first described it, an Australian mineral collector named Charles W. Marsh.[1][2][3] One of marshite’s distinguishing features is that prior to exposure to air the mineral is a faint honey-yellow color, once exposed to the air however it becomes a brick-red color.[1][2] Another characteristic useful in identifying marshite is the dark red color it fluoresces under short-wave (SW) and long-wave (LW) ultraviolet light.[1][3]
References
Bibliography
- Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 20-22.
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