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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
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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