Cervantite | |
---|---|
General | |
Category | Oxide mineral |
Formula (repeating unit) | Sb3+Sb5+O4 |
IMA symbol | Cvn[1] |
Strunz classification | 4.DE.30 |
Crystal system | Orthorhombic |
Crystal class | Pyramidal (mm2) (same H-M symbol) |
Space group | Pbn21 |
Unit cell | a = 5.43 Å, b = 4.81 Å, c = 11.76 Å; Z = 4 |
Identification | |
Color | Yellow to nearly white |
Crystal habit | Microscopic acicular crystals; massive |
Cleavage | Excellent on {001}, distinct on {100} |
Fracture | Conchoidal |
Mohs scale hardness | 4–5 |
Luster | Greasy, pearly, earthy |
Streak | Pale yellow to white |
Diaphaneity | Semitransparent |
Specific gravity | 6.5 |
Optical properties | Biaxial |
Refractive index | nα = 2.000 nγ = 2.100 |
Birefringence | δ = 0.100 |
Dispersion | relatively weak |
References | [2][3][4][5] |
Cervantite is an antimony oxide mineral with formula Sb3+Sb5+O4 (antimony tetroxide).
It was first described in 1850 for an occurrence in Cervantes, Galicia, Spain, and named for the locality.[4] The mineral was questioned and disapproved, but re-approved and verified in 1962 based on material from the Zajaca-Stolice district, Brasina, Serbia.[3] It occurs as a secondary alteration product of antimony bearing minerals, mainly stibnite.[3]
References
- ↑ 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.
- ↑ Mineralienatlas
- 1 2 3 Handbook of Mineralogy
- 1 2 Mindat.org
- ↑ Webmineral data
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