Mineral description : Oncosine

Oncosine from Varuträsk.

Oncosine vein from Haapaluoma, Finland.

Chemical formula	KAl2(OH,F)2(AlSi3O10)
Hardness	2.5
Density
Color	Rose, lilac, greygreen, grayish, translucent.
Luster	Pearly.
Description	Oncosine is a compact crypto-crystalline variety of muscovite and isn't considered to be an unique mineral.
Habitat	Usually in pegmatites.
Associates	Spodumene, amblygonite, beryl, lithium turmaline, cassiterite, muscovite, albite.
Notes
Locations	Varuträsk pegmatite. As massive pink aggregates and thin veins (in pollucite). Haapaluoma, Finland.

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