Images
Formula: CaB3O4(OH)3.H2O
Borate
Crystal System: Monoclinic
Specific gravity: 2.423 measured, 2.422 calculated
Hardness: 4½
Streak: White
Colour: Colourless, white
Solubility: Soluble in hot hydrochloric acid, slightly soluble in water
Environments:
Colemanite is a common constituent in borate deposits formed in arid
alkaline lacustrine environments, deficient in sodium and carbonate, typically under warm conditions. Associated
minerals include howlite, ulexite,
searlesite, priceite,
nobleite, ginorite,
gowerite, lüneburgite,
kernite, gypsum,
calcite and celestine
(HOM).
Back to Minerals