Manganoblödite
Manganoblödite is a rare manganese mineral with the formula Na2Mn(SO4)2·4H2O. Somewhat chemically similar mineral is D'Ansite-(Mn). Manganoblödite was found in the Blue Lizard mine, San Juan County, Utah, US, which is known for several relatively new secondary uranium minerals In the mine, manganoblödite occurs intimately intergrown with manganese-, cobalt- and nickel-enriched blödite and a yet another new mineral - cobaltoblödite. Manganoblödite, as suggested by its name is a manganese-analogue of blödite. It is also analogous to changoite, cobaltoblödite and nickelblödite - all three are members of the blödite group.
| Manganoblödite | |
|---|---|
| General | |
| Category | Sulfate mineral |
| Formula (repeating unit) | Na2Mn(SO4)2·4H2O |
| IMA symbol | Mblö |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P21/a |
| Unit cell | a = 11.14, b = 8.28, c = 5.54 [Å], β = 100.42° (approximated); Z = 2 |
| Identification | |
| Color | Colorless (grains), reddish-pink (aggregates) |
| Crystal habit | Anhedral grains, in aggregates |
| Cleavage | None |
| Fracture | Uneven |
| Mohs scale hardness | 2.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent |
| Specific gravity | 2.25 (measured), 2.34 (calculated) (approximated) |
| Optical properties | Biaxal (-) |
| Refractive index | nα=1.50, nβ=1.50, nγ=1.51 (approximated) |
| Common impurities | Mg, Co, Ni |
| References | |
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