Danburite

tectosilicate

wollastonite

Formula: CaB2Si2O8 br Tectosilicate (framework silicate)
Specific gravity: 2.9 to 3.0
Hardness: 7 to 7½
Streak: White
Colour: Colourless, yellowish to dark brown, pink
Solubility: Insoluble in hydrochloric, sulphuric and nitric acid
Environments:

Plutonic igneous environments
Pegmatites
Sedimentary environments
Metamorphic environments
Hydrothermal environments

Danburite occurs in hypothermal (high temperature) veins, where it is associated with quartz, cassiterite, fluorite and orthoclase, and in contact metamorphic rocks, where it is associated with andradite, wollastonite and sulphides.
Danburite occurs in granite and metamorphosed carbonates and evaporites, in skarn, in marine salt deposits and in alpine crevices.

Common impurities:Fe,Mn,Al,Mg,Sr,Na

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