Montebrasite
A variety of Minerals
What is Montebrasite?
Amblygonite ( /æmˈblɪɡənaɪt/) is a fluorophosphate mineral, (Li,Na)AlPO4(F,OH), composed of lithium, sodium, aluminium, phosphate, fluoride and hydroxide. The mineral occurs in pegmatite deposits and is easily mistaken for albite and other feldspars. Its density, cleavage and flame test for lithium are diagnostic. Amblygonite forms a series with montebrasite, the low fluorine endmember. Geologic occurrence is in granite pegmatites, high-temperature tin veins, and greisens. Amblygonite occurs with spodumene, apatite, lepidolite, tourmaline, and other lithium-bearing minerals in pegmatite veins. It contains about 10% lithium, and has been utilized as a source of lithium. The chief commercial sources have historically been the deposits of California and France.
Optical Properties
- Refractive Index
- 1.578-1.646
- Birefringence
- 0.020-0.030
- Optical Character
- Biaxial positive
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Montebrasite Localities Map
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Quick Facts
Physical Properties
- Color
- White, colorless, gray white, very pale brown, pale pink, pale yellow
- Hardness (Mohs)
- 5.5 - 6
- Density
- 3.03 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- LiAl(PO4)(OH)
- Elements
- Al, H, Li, O, P

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