Iodargyrite

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Iodargyrite
Iodargyrite-263859.jpg
Iodargyrite on gossan, Broken Hill Ore Deposit, New South Wales, Australia. Size: 9.3 x 6.3 x 5.7 cm.
General
Category Halide minerals
Formula
(repeating unit)
AgI
Strunz classification 03.AA.10
Crystal symmetry 6mm - Dihexagonal Pyramidal
Unit cell a = 4.59Å, c = 7.51Å
Identification
Color Colourless (fresh); pale yellow, yellow, greenish yellow, brownish, grayish
Crystal system Hexagonal
Mohs scale hardness 1½ - 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[edit]