Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
orthorhombicuncommonBorates
Boracite
Mg₃B₇O₁₃Cl
Boracite forms small, well-formed crystals, often pseudocubic, with a vitreous to adamantine luster, typically appearing colorless, white, yellowish, or greenish.
Boracite Physical Properties
Mohs Hardness
7.5Crystal System
orthorhombicLuster
vitreousStreak Color
whiteCleavage
indistinct {110}Fracture
conchoidalSpecific Gravity
2.95Colors
colorless, white, gray, yellowish, greenish, bluishTransparency
transparentType Locality
Kalkberg hill, Lüneburg, Lower Saxony, GermanyMineral Group
BoratesUses
collector, minor_boron_oreAssociated Minerals
gypsum, anhydrite, halite, carnallite, sylviteRarity
uncommonGeological Context
This rare borate mineral is found primarily in evaporite deposits, particularly within salt domes, where it crystallizes from highly concentrated boron-rich brines.
