Bromargyrite

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Bromargyrite

Bromargyrite with Silver - San Onofre, Mexiko.
General
Category Halide minerals
Chemical formula AgBr
Strunz classification 03.AA.15
Crystal symmetry m3m (4/m 3 2/m) - Hexoctahedral
Unit cell a = 5.7745Å
Identification
Color Yellowish, greenish brown, bright green
Crystal system Isometric
Cleavage None observed
Fracture Irregular/uneven, sub-conchoidal
Tenacity Sectile
Mohs scale hardness
Luster Adamantine, resinous, waxy
Streak White to yellowish white
Diaphaneity Transparent, translucent
Specific gravity 6.474
Optical properties Isotropic
Refractive index n = 2.253
Birefringence δ = 0.000

Bromyrite or bromargyrite is a natural mineral form of silver bromide found mainly in Mexico and Chile. Hardness is 1.5 to 2. Related are chlorargyrite and iodyrite.

[edit] References

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