Amblygonite
A variety of Minerals
What is Amblygonite?
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
- Pleochroism
- Absent
- Optical Character
- Biaxial positive or negative
- Dispersion
- 0.014-0.015
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Amblygonite 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.
Amblygonite Localities Map
See where Amblygonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
The Meaning
Amblygonite has gained the nickname "The Prophet Stone" in the years since it was first found by Europeans in the nineteenth century, however, the understanding behind the name's origin is limited. It is believed that it may have been given this title in folklore because of use in divination as a "visionary stone."
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Quick Facts
Physical Properties
- Color
- Milk-white, yellow, beige, salmon-pink, pale green, light blue, grey, colourless in transmitted light
- Hardness (Mohs)
- 5.5 - 6
- Density
- 3.11 g/cm³
- Streak
- white
Chemical Properties
- Chemical Formula
- LiAl(PO4)F
- Elements
- Al, F, Li, O, P
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Amblygonite FAQs
How do I identify Amblygonite?
Amblygonite can be identified by its hardness of 5.5 - 6 on the Mohs scale, Milk-white color. Look for these key characteristics when examining specimens.
What color is Amblygonite?
Amblygonite typically appears in Milk-white, yellow, beige, salmon-pink, pale green, light blue, grey, colourless in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Amblygonite?
Amblygonite has a hardness of 5.5 - 6 on the Mohs scale. This gives it moderate hardness.
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