Iceland spar calcite

Iceland spar is a transparent water clear variety of calcite.
Mineral class-carbonate
Crystal system- Trigonal
Crystal habits- Typically forms rhombohedral crystals (slanted boxes/cubes) with perfect rhombohedral cleavage in three directions.
Hardness- 3 on the MOHs scale
Rock formation- precipitates from calcium and carbonate rich aqueous solutions in sedimentary environments (limestone and dolomite),hydrothermal veins and evaporite deposits.
Found inside cavities and veins running through basalt,limestone or marble.

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