Shortite

carbonate

pyrite

Formula: Na2Ca2(CO3)3 anhydrous normal carbonate
Specific gravity: 2.6
Hardness: 3
Streak: White
Colour: Colourless, light yellow, light green
Solubility: Decomposes in water giving a calcium carbonate precipitate.
Environments:

Carbonatites
Sedimentary environments

Shortite occurs with calcite and pyrite as single crystals in bands in the montmorillonite clay associated with trona at the Green River formation, Wyoming, USA. It also occurs as minute inclusions in apatite from Tororo carbonatite complex, Eastern Region, Uganda.

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