Danburite
Image: Didier Descouens (CC BY-SA 4.0)
Mineral NameDanburite
Chemical FormulaCaB2(SiO4)2
Mohs Hardness7
Crystal Systemorthorhombic
Lustervitreous
Streak Colorwhite
Cleavagepoor/indistinct on {001}
Fractureconchoidal
Specific Gravity3
Colorsyellowish-brown, golden, colorless, white, pink, pale yellow
Transparencytransparent
Type LocalityAnjanabonoina, Ikaka, Ambohimanambola Commune, Betafo District, Vakinankaratra Region Antananarivo Province, Madagascar
Mineral GroupSilicates
Usesjewelry, collector
Associated Mineralsquartz, feldspar, calcite, fluorite, apophyllite, datolite, axinite
Rarityuncommon
Description
This image displays a faceted oval-cut Danburite gemstone, exhibiting a clear, yellowish-brown to golden color with excellent transparency and brilliant internal reflections.
Geological Context
Danburite typically forms in contact metamorphic rocks, particularly in limestones or dolomites that have undergone metasomatism by boron-rich fluids, and can also be found in pegmatites.
