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
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Montebrasite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Quick Facts
Physical Properties
- Color
- White, colorless, gray white, very pale brown, pale pink, pale yellow
- Hardness (Mohs)
- 5.5 - 6
- Rock tumbling
- With care
- Density
- 3.03 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- LiAl(PO4)(OH)
- Elements
- Al, H, Li, O, P
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Montebrasite FAQs
How do I identify Montebrasite?
Montebrasite can be identified by its hardness of 5.5 - 6 on the Mohs scale, White color. Look for these key characteristics when examining specimens.
What color is Montebrasite?
Montebrasite typically appears in White, colorless, gray white, very pale brown, pale pink, pale yellow. Color can vary depending on impurities and formation conditions.
How hard is Montebrasite?
Montebrasite has a hardness of 5.5 - 6 on the Mohs scale. This gives it moderate hardness.
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