Images
Formula: HBO2
Anhydrous megaborate, isometric
paramorph of monoclinic
clinometaborite
Crystal System: Isometric
Specific gravity: 2.47 measured, 2.489 calculated
Hardness: 5
Colour: Colourless, pale brown
Solubility: Slowly soluble in water
Environments
Localities
At the type locality, the Chelkar salt dome, Aksai Valley, Shalkar District, Aktobe Region, Kazakhstan,
metaborite occurs in aggregates up to 1 cm in size in rock salt with
small amounts of anhydrite,
boracite, aksaite,
ginorite, hilgardite,
strontioborite and
halurgite. Metaborite is replaced by
boracite and ginorite
(AM 50.261-268).
Metaborite from Chelkar - Image
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