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)
hexagonalvery-rareBorates
Jeremejevite
Al₆(BO₃)₅(F,OH)₃
This image displays a superb, gemmy, and lustrous light blue jeremejevite crystal, approximately 6 mm in size, aesthetically set. It exhibits a hexagonal prismatic habit typical of the mineral.
Jeremejevite Physical Properties
Mohs Hardness
6.5Crystal System
hexagonalLuster
vitreousStreak Color
whiteCleavage
poor/indistinct on {1010}Fracture
conchoidalSpecific Gravity
3.29Colors
light blue, colorless, white, yellowish, brownish, violetTransparency
transparentType Locality
Erongo Mountain, Usakos and Omaruru Districts, Erongo Region, NamibiaMineral Group
BoratesUses
gemstone, collectorAssociated Minerals
quartz, tourmaline, albite, microcline, schorl, fluorite, apatiteRarity
very-rareGeological Context
Jeremejevite is a rare borate mineral typically found in granite pegmatites and contact metamorphic deposits. Its formation is associated with boron-rich fluids in these geological environments.
