Manganoblödite

Manganoblödite
General
Category Sulfate mineral
Formula
(repeating unit)
Na2Mn(SO4)2•4H2O
Crystal system Monoclinic
Space group P21/a
Space group Monoclinic - Prismatic (2/m)
Unit cell a=11.14, b=8.28, c=5.54 [Å], β=100.42o (approximated)
Identification
Color Colorless (grains), reddish-pink (aggregates)
Crystal habit anhedral grains, in aggregates
Cleavage None
Fracture Uneven
Mohs scale hardness ca. 2.5
Luster Vitreous
Streak White
Diaphaneity Transparent
Density 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 [1][2]

Manganoblödite is a very rare manganese mineral with the formula Na2Mn(SO4)2•4H2O.[1][2] Somewhat chemically similar mineral is D'Ansite-(Mn)[3] Manganoblödite was found in the Blue Lizard mine, San Juan County, Utah, US, which is known for several relatively new secondary uranium minerals[4] 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.[2]

Notes on chemistry

Manganoblödite is impure, containing admixtures of magnesium, cobalt 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. 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, US. Mineralogical Magazine 77(3), 367-383
  2. 1 2 3 "Manganoblödite: Manganoblödite mineral information and data". Mindat.org. Retrieved 2016-03-11.
  3. "D'Ansite-(Mn): D'Ansite-(Mn) mineral information and data". Mindat.org. Retrieved 2016-03-10.
  4. "Blue Lizard Mine, Chocolate Drop, Red Canyon, White Canyon District, San Juan Co., Utah, USA - Mindat.org". Mindat.org. Retrieved 2016-03-10.


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