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
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Amblygonite Localities Map
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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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