Minerals identify

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Alstonite

Carbonate mineral

Alstonite, also known as bromlite, is a low temperature hydrothermal carbonate with the formula BaCa(CO 3) 2, sometimes with some strontium and paralstonite have the same formula but different structures, so these three minerals are said to be trimorphous. Alstonite is triclinic but barytocalcite and paralstonite is trigonal. The species was named bromlite by Thomas Thomson in 1837 after the Bromley-Hill mine, and alstonite by August Breithaupt of the Freiberg Mining Academy in 1841, after Alston, Cumbria, the base of operations of the mineral dealer from whom the first samples were obtained by Thomson in 1834. Both of these names have been in common use.

Identification

Mohs scale ( mineral hardness )

4

Density ( specific gravity )

1.526
1.671
1.672

Crystal ( diaphaneity )

Triclinic