Girish Mahajan (Editor)

Plášilite

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Category  Sulfate mineral
Crystal system  Monoclinic
Formula (repeating unit)  Na(UO2)(SO4)(OH)•2H2O
Space group  P21/c
Crystal class  Prismatic (2/m) (same H-M symbol)
Unit cell  a = 8.71, b = 13.84, c = 7.05 [Å], β = 112.13° (approximated)

Plášilite is a very rare uranium mineral with the formula Na2(UO2)(SO4)2•3H2O. Chemically related minerals include natrozippeite, belakovskiite, meisserite, fermiite and oppenheimerite. Most of these uranyl sulfate minerals were originally found in the Blue Lizard mine, San Juan County, Utah, US. The mineral is named after Czech crystallographer Jakub Plášil.

Contents

Association and origin

Plášilite is associated with other sulfate minerals: natrozippeite, johannite, blödite, brochantite, chalcanthite, gypsum, hexahydrite, manganoblödite, and tamarugite. Non-sulfate coexisting minerals include atacamite, calcite, dickite and gerhardtite. Plášilite is secondary in origin, being the product of weathering of the primary uranium mineral, uraninite.

Crystal structure

The crystal structure of plášilite is of a new type. Its building blocks are:

  • (UO2)2(SO4)2(OH)2 sheets, with a charge 2-, parallel to (010), of a phosphuranylite topology
  • edge-sharing NaO2(H2O)4 polyhedra, parallel to [001]
  • The sodium-bearing polyhedra link the uranyl-sulfate sheets. It terms of sheet geometry, crystal structure of plášilite is similar to that of deliensite.

    References

    Plášilite Wikipedia


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