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

Montebrasite Market Value Calculator

Estimate the market value of Montebrasite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Preview only. Full pricing comps and valuation report in the app.

Montebrasite Localities Map

See where Montebrasite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview
North ZoneCentral RidgeSouth Basin

Interactive map layers and collecting notes are available in the app.

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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