Mineral description : Chrysoberyl

Green chrysoberyl in beryl from Kolsva.

Mineral class Oxides : Corundum - Spinel - Chrysoberyl group
Chemical formula BeAl2O4
Crystal system Orthorombic.
Habitus Tabular crystals, often twinned three together forming pseudohexagonal crystals.
Cleavage One incomplete cleavage.
Hardness 8.5
Density 3.7
Color Green, yellow, gray and brown.
Streak  
Luster Adamantine to vitreous, transparent to translucent.
Description  
Occurance In pegmatites poor on quartz. Also in some schists.
The hardness and weight makes it also possible to find it in alluvial deposits.
Associates Beryl, feldspar.
Notes Chrysoberyl is used as an gemstone. Some of the varietes is :
  • Alexandrite : A clear crysoberyl which is green in sunlight and red in artificial light.
  • Cats eye : A variety with inclusions of rutile.
Locations A rare mineral
  • Kolsva, Västmanland. Common as yellowish green anhedral crystals in beryl.
  • Ytterby, Stockholm. In small amounts.

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Last changed : 1999-09-08