Cobaltoblödite
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| Cobaltoblödite | |
|---|---|
| General | |
| Category | Sulfate mineral |
| Formula | Na2Co(SO4)2·4H2O |
| IMA symbol | Cblö[1] |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P21/a |
| Unit cell | a = 11.15, b = 8.27, c = 5.54 [Å], β=100.52° (approximated); Z = 2 |
| Identification | |
| Color | Colorless (grains), reddish-pink (aggregates) |
| Crystal habit | Anhedral grains, in aggregates, forming crusts |
| Cleavage | None |
| Fracture | Uneven |
| Mohs scale hardness | 2.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent |
| Specific gravity | 2.29 (measured), 2.35 (calculated) (approximated) |
| Optical properties | Biaxal (-) |
| Refractive index | nα=1.50, nβ=1.50, nγ=1.51 (approximated) |
| References | [2][3] |
Cobaltoblödite is a rare cobalt mineral with the formula Na2Co(SO4)2·4H2O.[2][3] Cobaltoblödite was found in the Blue Lizard mine, San Juan County, Utah, USA, which is known for secondary uranium minerals.[4] Cobaltoblödite occurs intimately intergrown with manganese-, cobalt- and nickel-enriched blödite and a yet another new mineral - manganoblödite. Cobaltoblödite, as suggested by its name is a cobalt-analogue of blödite. It is also analogous to changoite, manganoblödite and nickelblödite - other members of the blödite group.[3]