Mineral description : Cookeite

Rubellite transformed into cookeite from Varuträsk, Västerbotten.

Chemical formula	LiAl3(OH)6(Si2O6)
Hardness	2.5
Density	2.6
Color	Light yellow-green to light pink
Luster	?
Description	Fine grained and compact masses.
Notes	Formed by transformation of rubellite. Also as fillings in cracks.
Locations	A rare mineral in Sweden. Found at the following locations : Varuträsk pegmatite, Västerbotten. Helgeland, Norway. In the Viitaniemi pegmatite, Finland. In the Haapaluoma pegmatite, Finland.

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