Tilasite
A variety of Minerals
What is Tilasite?
Tilasite is an arsenate mineral gemstone, with the elemental formula CaMg(AsO4)F. It prefers the monoclinic form of crystal, and has Mohs hardness of 5. It was named in 1895 by Sten Anders Hjalmar Sjögren in honor of Daniel Tilas, who was once director of mines for Sweden, and a regional governor for Västmanland. It was first discovered in Langban, Varmland. In 1972, Bladh et al. characterised samples found near Bisbee, Arizona. In 1994, Bermanec discovered centro-symmetric Tilasite near Nezhilovo, North Macedonia.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tilasite 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.
Tilasite Localities Map
See where Tilasite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Light gray, violet-gray, pinkish red; olive-green, apple-green; colourless or pale green in transmitted light.
- Hardness (Mohs)
- 5
- Density
- 3.78 g/cm³
Chemical Properties
- Chemical Formula
- CaMg(AsO4)F
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Tilasite FAQs
How do I identify Tilasite?
Tilasite can be identified by its hardness of 5 on the Mohs scale, Light gray color. Look for these key characteristics when examining specimens.
What color is Tilasite?
Tilasite typically appears in Light gray, violet-gray, pinkish red; olive-green, apple-green; colourless or pale green in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Tilasite?
Tilasite has a hardness of 5 on the Mohs scale. This gives it moderate hardness.
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