Marshite - a rare, little-described mineral. Iodide. It loses transparency in the light.
You can see chrysopal stone for sale and buy it in the Minerals of Russia online store.
General | |
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Category | Halide mineral |
Formula (repeating unit) |
CuI |
IMA symbol | Msh |
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 (untwinned a = 6.6063(1) 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) |