Acuminite
A variety of Minerals
What is Acuminite?
Acuminite is a rare halide mineral of with chemical formula: SrAlF4(OH)·(H2O). Its name comes from the Latin word acumen, meaning "spear point". Its Mohs scale rating is 3.5. Acumenite has only been described from its type locality of the cryolite deposit in Ivigtut, Greenland.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Acuminite 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.
Acuminite Localities Map
See where Acuminite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colourless, white, becomes yellow on exposure to x-rays
- Hardness (Mohs)
- 3.5
- Density
- 3.305 g/cm³
- Streak
- white
Chemical Properties
- Chemical Formula
- Sr[AlF4(OH)(H2O)]
- Elements
- Al, F, H, O, Sr
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Acuminite FAQs
How do I identify Acuminite?
Acuminite can be identified by its hardness of 3.5 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Acuminite?
Acuminite typically appears in Colourless, white, becomes yellow on exposure to x-rays. Color can vary depending on impurities and formation conditions.
How hard is Acuminite?
Acuminite has a hardness of 3.5 on the Mohs scale. This gives it moderate hardness.
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