Ushkovite

phosphate

mitridatite

Formula:MgFe3+2(PO4)2(OH)2.8H2O
Hydrated phosphate containing hydroxyl
Specific gravity: 2.38
Hardness: 3½
Streak: Pale yellow
Colour: Pale yellow, orange-yellow, orange, orange brown
Environments

Pegmatites

Ushkovite is a rare phosphate. Common associates include hydroxylapatite, jahnsite, manganese oxides, mitridatite, siderite, stewartite and strunzite (Mindat).

At Tom's quarry, Kapunda, Mount Lofty ranges, South Australia, ushkovite has been found associated with apatite, leucophosphite, mitridatite, xanthoxenite and natrodufrénite (AJM 17.1.26).

At the type locality, Pit No. 232, Bol'shoi Tatkul' Lake, Chelyabinsk Oblast, Russia, ushkovite is found as a supergene product of weathering of triplite in granite pegmatites associated with triplite, manganese hydroxides, carbonate-rich fluorapatite, mitridatite and beraunite (Dana, AM 69.212, Webmin, Mindat).

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