Euclase
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameEuclase
Chemical FormulaBeAlSiO4(OH)
Mohs Hardness7.5
Crystal Systemmonoclinic
Lustervitreous
Streak Colorwhite
Cleavageperfect on {010}
Fractureconchoidal
Specific Gravity3.05
Colorscolorless, white, pale blue, pale green, yellow
Transparencytransparent
Type LocalityBoa Vista, Rodrigo Silva, Ouro Preto, Minas Gerais, Brazil
Mineral Groupsilicates
Usesjewelry, collector
Associated Mineralsquartz, feldspar, topaz, phenakite, mica, beryl
Rarityuncommon
Description
This image displays a well-formed, transparent, pale blue euclase crystal exhibiting distinct crystal faces and a bright vitreous luster.
Geological Context
Euclase typically forms in beryllium-rich pegmatites, often associated with other rare minerals. It can also be found in alpine-type veins and certain metamorphic rocks.
