Sulfoborite

sulfoborite

carnallite

preobrazhenskite

kieserite

Images

Formula: Mg3[B(OH)4]2(SO4)(OH,F)2
Monoborate
Crystal system: Orthorhombic
Specific gravity: 2.38 to 2.45 measured, 2.44 calculated
Hardness: 4 to 4½
Colour: Colourless, reddish (from included iron oxide); colourless in transmitted light
Solubility: Soluble in acids, decomposed by water
Environments

Evaporite deposits

Sulfoborite is an uncommon mineral in marine salt deposits (HOM).

Localities

At the type locality, the Douglashall III potash mine, Westeregeln, Börde-Hakel, Salzlandkreis, Saxony-Anhalt, Germany, sulfoborite is associated with carnallite, anhydrite, boracite, celestine and kieserite (HOM).
Sulfoborite from the Douglashall III potash mine - Image

At the Inder B deposit and salt dome, Inder District, Atyrau Region, Kazakhstan, sulfoborite is associated with polyhalite, kaliborite, aphthitalite, carnallite and preobrazhenskite (HOM).
Sulfoborite from the Inder B deposit and salt dome - Image

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