| Cobaltoblödite | |
| Category: | Sulfate mineral |
| Formula: | Na2Co(SO4)2·4H2O |
| Imasymbol: | Cblö[1] |
| System: | Monoclinic |
| Class: | Prismatic (2/m) (same H-M symbol) |
| Symmetry: | P21/a |
| Unit Cell: | a = 11.15, b = 8.27, c = 5.54 [Å], β=100.52° (approximated); Z = 2 |
| Color: | Colorless (grains), reddish-pink (aggregates) |
| Habit: | Anhedral grains, in aggregates, forming crusts |
| Cleavage: | None |
| Fracture: | Uneven |
| Mohs: | 2.5 |
| Luster: | Vitreous |
| Streak: | White |
| Diaphaneity: | Transparent |
| Gravity: | 2.29 (measured), 2.35 (calculated) (approximated) |
| Opticalprop: | Biaxal (-) |
| Refractive: | nα=1.50, nβ=1.50, nγ=1.51 (approximated) |
| References: | [2] |
Cobaltoblödite is a rare cobalt mineral with the formula Na2Co(SO4)2·4H2O.[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.
Manganoblödite is impure, containing admixtures of magnesium, manganese and nickel.
Besite blödite and cobaltoblödite, other minerals associated with manganoblödite include chalcanthite, gypsum, johannite, sideronatrite, a feldspar group-mineral and quartz.