Iodargyrite Knowpia

Iodargyrite
Iodargyrite
	Iodargyrite on gossan, Broken Hill Ore Deposit, New South Wales, Australia.
General
Category	Halide minerals
Formula; (repeating unit)	AgI
IMA symbol	Iag
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

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

Related minerals are chlorargyrite and bromargyrite.

References edit

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ Mindat page for iodargyrite
^ Webmineral page for iodargyrite