Lazulite
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameLazulite
Chemical Formula(Mg,Fe2+)Al2(PO4)2(OH)2
Mohs Hardness5.5
Crystal Systemmonoclinic
Lustervitreous
Streak Colorwhite
Cleavagedistinct on {110}
Fractureuneven to conchoidal
Specific Gravity3.16
Colorsdeep blue, azure blue, greenish-blue
Transparencytranslucent
Type LocalityRapid Creek, Dawson Mining District, Yukon Territory, Canada
Mineral Groupphosphates
Usescollector, minor gemstone
Associated Mineralsquartz, rutile, kyanite, wardite, gormanite
Rarityuncommon
Description
This specimen features a cluster of deep blue to teal lazulite crystals, exhibiting a vitreous luster. The crystals are well-formed, appearing blocky and partially embedded in a lighter greyish matrix.
Geological Context
Lazulite typically forms in high-grade metamorphic rocks, such as quartzites, and in pegmatites. It can also be found in hydrothermal veins, often associated with other phosphate minerals.
