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Formula: LiAl(PO4)F
Anhydrous phosphate containing halogen, amblygonite group,
lithium-bearing mineral, forms a series with
montebrasite
Crystal System: Triclinic
Specific gravity: 3.04 to 3.11 measured, 3.11 calculated
Hardness: 6
Streak: White
Colour: White, grey, yellow to brown, greenish, bluish
Luminescence: May fluoresce faint to medium cream yellow in short wave and long wave UV. Often shows patchy response.
Solubility: Amblygonite is slightly soluble in hydrochloric, sulphuric or nitric acid
Environments:
Plutonic igneous environments
Pegmatites
Amblygonite is a rare phosphate typically found in lithium-rich
granite
pegmatites, in high-temperature
tin veins and in greisens.
Common associates in pegmatites include
lacroixite, fluorapatite,
lithiophilite, petalite,
pollucite, spodumene,
tourmaline, lepidolite,
apatite and triphylite
In greisens the associates are
cassiterite, topaz and
mica
(HOM).
Localities
At the type locality, Chursdorf, Penig, Mittelsachsen, Saxony, Germany, massive amblygonite occurs in a
granite
pegmatite, associated with
tourmaline and topaz
(Mindat).
Alteration
Amblygonite alters to mixtures of smectite group minerals or
kaolinite and mica, often as
alterations rimming or surrounding rounded nodules of unaltered material. Amblygonite also alters to
lacroixite, turquoise,
wavellite, wardite and
morinite
(Mindat).
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