Bromargyrite
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.
Bromargyrite | |
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Bromargyrite with Silver - San Onofre, Mexico. | |
General | |
Category | Halide minerals |
Formula (repeating unit) | AgBr |
Strunz classification | 3.AA.15 |
Crystal system | Isometric |
Crystal class | Hexoctahedral (m3m) H-M symbol (4/m 3 2/m) |
Space group | Fm3m |
Unit cell | a = 5.7745 Å; Z = 4 |
Identification | |
Color | Yellowish, greenish brown, bright green |
Cleavage | None observed |
Fracture | Irregular/uneven, sub-conchoidal |
Tenacity | Sectile |
Mohs scale hardness | 2 1⁄2 |
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 |
References | [1][2][3] |
It was first described in 1859 for an occurrence in Plateros, Zacatecas, Mexico where it occurred in a silver deposit as an oxidation product of primary ore minerals.[1] It occurs in arid environments along with native silver, iodargyrite and smithsonite along with iron and manganese oxide minerals.[3]
References
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