Cobaltoblödite
| Cobaltoblödite | |
|---|---|
| General | |
| Category | Sulfate mineral |
| Formula (repeating unit) | Na2Co(SO4)2•4H2 |
| Crystal system | Monoclinic, P21/a |
| Unit cell | a=11.15, b=8.27, c=5.54 [Å], β=100.52o (approximated) |
| Identification | |
| Color | Colorless (grains), reddish-pink (aggregates) |
| Crystal habit | anhedral grains, in aggregates, forming crusts |
| Crystal symmetry | Monoclinic - Prismatic (2/m) |
| Cleavage | None |
| Fracture | Uneven |
| Mohs scale hardness | ca. 2.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent |
| Density | 2.29 (measured), 2.35 (calculated) (approximated) |
| Optical properties | Biaxal (-) |
| Refractive index | nα=1.50, nβ=1.50, nγ=1.51 (approximated) |
| Common impurities | Mg, Co, Ni |
| References | [1][2] |
Cobaltoblödite is a very rare cobalt mineral with the formula Na2Mn(SO4)2•4H2O.[1][2] Cobaltoblödite was found in the Blue Lizard mine, San Juan County, Utah, USA, which is known for secondary uranium minerals[3] 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.[2]
Notes on chemistry
Manganoblödite is impure, containing admixtures of magnesium, manganese and nickel.[1]
Association and origin
Besite blödite and cobaltoblödite, other minerals associated with manganoblödite include chalcanthite, gypsum, johannite, sideronatrite, a feldspar group-mineral and quartz.[1]
References
- 1 2 3 4 Kasatkin, A.V., Nestola, F., Plášil, J., Marty, J., Belakovskiy, D.I., Agakhanov, A.A., Mills, S.J., Pedron, D., Lanza, A., Favaro, M., Bianchin, S., Lykova, I.S., Goliáš, V., and Birch, W.D., 2013. Manganoblödite, Na2Mn(SO4)2·4H2O, and cobaltoblödite, Na2Co(SO4)2·4H2O: two new members of the blödite group from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine 77(3), 367-383
- 1 2 3 "Cobaltoblödite: Cobaltoblödite mineral information and data". Mindat.org. Retrieved 2016-03-11.
- ↑ "Blue Lizard Mine, Chocolate Drop, Red Canyon, White Canyon District, San Juan Co., Utah, USA - Mindat.org". Mindat.org. Retrieved 2016-03-10.