Iodargyrite
Iodyrite or iodargyrite is a natural mineral form of silver iodide.
| Iodargyrite | |
|---|---|
 Iodargyrite on gossan, Broken Hill Ore Deposit, New South Wales, Australia. | |
| General | |
| Category | Halide minerals |
| Formula (repeating unit) | AgI |
| 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 |
Hardness is 1.5 to 2.
Related are chlorargyrite and bromargyrite.
References
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