Iodargyrite

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

Iodyrite or iodargyrite is a natural mineral form of silver iodide.

Hardness is 1.5 to 2.

Related are chlorargyrite and bromargyrite.

References

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