Shortite

minerals

montmorillonite

trona

pyrite

Images
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.
Shortite is strongly pyroelectric. It inverts at about 200oC and melts incongruently at about 600oC (Mindat).
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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