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.

How to Identify Tilasite | Properties, Meaning & Uses

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.

Tilasite Market Value Calculator

Estimate the market value of Tilasite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Tilasite Localities Map

See where Tilasite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview

North ZoneCentral RidgeSouth Basin

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