Chrysoberyl
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameChrysoberyl
Chemical FormulaBeAl₂O₄
Mohs Hardness8.5
Crystal Systemorthorhombic
Lustervitreous
Streak Colorwhite
Cleavagedistinct on {110}, poor on {010} and {100}
Fractureconchoidal to uneven
Specific Gravity3.7
Colorsyellow, yellowish-green, green, brown
Transparencytransparent
Type LocalityEspirito Santo, Brazil
Mineral GroupOxides
Usesjewelry, collector
Associated Mineralsquartz, feldspar, mica, beryl, tourmaline
Rarityuncommon
Description
This specimen features a relatively large, sharp, twinned crystal of chrysoberyl, displaying a yellowish-green to golden-yellow hue. The crystal exhibits an incredibly sharp form, noted for its distinct twinning pattern.
Geological Context
Chrysoberyl typically forms in granitic pegmatites, mica schists, and sometimes in contact metamorphic deposits. Its high hardness allows it to be found in alluvial deposits as well.
