Iodargyrite | |
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General | |
Category | Halide minerals |
Formula (repeating unit) | AgI |
IMA symbol | Iag[1] |
Strunz classification | 3.AA.10 |
Crystal system | Hexagonal |
Crystal class | Dihexagonal pyramidal (6mm) H-M symbol: (6mm) |
Space group | P6mm |
Unit cell | a = 4.59, c = 7.51 [Å]; Z = 2 |
Identification | |
Color | Colorless (fresh); pale yellow, yellow, greenish yellow, brownish, grayish |
Mohs scale hardness | 1+1⁄2 – 2 |
Luster | Adamantine, resinous |
Streak | Yellow (shining) |
Diaphaneity | Transparent, translucent |
Specific gravity | 5.69 |
Optical properties | Uniaxial (+) |
Refractive index | nω = 2.210 nε = 2.220 |
Birefringence | δ = 0.010 |
References | [2][3] |
Iodyrite or iodargyrite is a natural mineral form of silver iodide.
Related minerals are chlorargyrite and bromargyrite.