Mineral description : Amblygonite

Mineral class	Phosphates : Amblygonite - Pharmakosiderite group.
Chemical formula	(Li,Na)Al(F,OH)PO4
Crystal system	Triclinic.
Habitus	Columnar or prismatic crystal, as euhedral crystals or as coarse crystalline masses.
Cleavage	Lamellar cleavage, [100] perfect, [110] good, [011]distinct, fracture uneven.
Hardness	6
Density	3-3.1
Color	White, blue green to yellowish white.
Streak	White.
Luster	Vitreous, pearly on cleavages.
Description
Occurance	In granitic pegmatites and pneumalytic dykes in granite.
Associates
Notes	The high lithium contents gives red coloring of a flame. Type locality : Chursdorf and Arnsdorf, Penig, Sachsen, Germany. Hard to separate from montebrasite. Amblygonite of gem quality often have a pale green flourescens.
Locations	A less 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. Amblygonite is less common than montebrasite. Utö, Stockholm archipelago.

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