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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