Preobrazhenskite

preobrazhenskite

inyoite

kaliborite

boracite

Images

Formula: Mg3B11O15(OH)9
Megaborate
Crystal System: Orthorhombic
Specific gravity: 2.45 calculated
Hardness: 4½ to 5
Streak: White
Colour: Colourless, lemon-yellow, dark grey
Environments

Salt domes

Preobrazhenskite occurs in fine-grained halitepolyhalite rock. Associated minerals include inyoite, halite, polyhalite, kieserite, anhydrite, aksaite, boracite, ginorite, halurgite, strontioborite, metaborite and kaliborite (HOM).

Localities

At the type locality, the Inder B deposit and salt dome, Inder District, Atyrau Region, Kazakhstan, preobrazhenskite is wide-spread in small amounts in several parts of the area. It occurs in colourless, lemon-yellow and dark grey nodules in fine-grained halitepolyhalite rock and encloses kaliborite and boracite. In places it has been partially replaced by inyoite (AM 42.704).
Preobrazhenskite from the Inder B deposit and salt dome - Image

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