Zincoberaunite
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CategoryPhosphate minerals
FormulaZnFe3+5(OH)5(PO4)4·6H2O
IMA symbolZbru[1]
Strunz classification8.DC.27
| Zincoberaunite | |
|---|---|
| General | |
| Category | Phosphate minerals |
| Formula | ZnFe3+5(OH)5(PO4)4·6H2O |
| IMA symbol | Zbru[1] |
| Strunz classification | 8.DC.27 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/c |
| Unit cell | a = 20.837(2) Å, b = 5.1624(4) Å, c = 19.250(1) Å; β = 93.252(5)° |
| Identification | |
| Color | Light gray, light greenish yellow |
| Crystal habit | Fiber, capillary or prismatic microcrystals |
| Mohs scale hardness | 3–4 |
| Luster | VSilky, vitreous |
| Diaphaneity | Translucent |
| Specific gravity | 2.94 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.745 nβ = 1.760 nγ = 1.770 |
| Birefringence | δ = 0.025 |
| 2V angle | Measured: 80° |
| References | [2] |
Zincoberaunite is an iron and zinc phosphate mineral, the Zn analogue of beraunite. It was first described by Chukanov et al. for an occurrence in Hagendorf Sud pegmatite in Germany.[3] Zincoberaunite occurs as a secondary mineral as an alteration product of primary phosphate minerals in granite pegmatites.
Beraunite crystallizes in the monoclinic crystal system with point group 2/m. Beraunite's formula is Zn Fe3+5(OH)5(PO4)4·4H2O.