Mineral description : Montebrasite

Montebrasite (or amblygonite) from Varuträsk.

Mineral class	Phosphates : Amblygonite - Pharmakosiderite group.
Chemical formula	LiAl(OH,F)PO4
Crystal system	Orthorombic.
Habitus	As large euhedral crystals.
Cleavage
Hardness	6
Density	3.025
Color	White.
Streak	White.
Luster	Vitreous.
Description
Occurance	In lithium bearing granitic pegmatites.
Associates
Notes	The high lithium contents gives red coloring of a flame. Type locality : Montebras, Soumans, Creuse, France. Hard to separate from amblygonite.
Locations	A not so common mineral in Sweden. Varuträsk pegmatite, Skellefteå, Västerbotten. Commonly as large cleavable masses (up to 1.5m) or single coarse crystals of 1.5 to 10 cm size. Montebrasite is more common than amblygonite.

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