Halurgite

halurgite

preobrazhenskite

pinnoite

strontioborite

Images

Formula: Mg4[B8O13(OH)2]2.7H2O
Hydrated tetraborate
Crystal System: Monoclinic
Specific gravity: 2.19 measured
Hardness: 2½ to 3
Streak: White
Colour: White
Solubility: Slightly soluble in cold water, dissolves completely in boiling water
Environments

Salt domes

Although halurgite was approved as early as 1962, to date (March 2025) it has been reported only from the Type locality.

Localities

At the type locality, the Chelkar salt dome, Aksai Valley, Shalkar District, Aktobe Region, Kazakhstan, halurgite is of rare occurrence in interstices and vugs in the rock salt diapir (A dome or anticlinal fold in which the overlying rocks have been ruptured by the squeezing-out of plastic core material - (Mindat)). Associated minerals include boracite, kaliborite, pinnoite, hilgardite, ginorite, bischofite, kieserite, preobrazhenskite, aksaite, strontioborite, metaborite, anhydrite and halite (HOM).
Halurgite from the Chelkar Salt Dome - Image

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