How do I identify Mullite?

Mullite can be identified by its hardness of 6 - 7 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.

What color is Mullite?

Mullite typically appears in Colourless, white, yellow, pink, red, gray. Color can vary depending on impurities and formation conditions.

Mullite has a hardness of 6 - 7 on the Mohs scale. This gives it moderate hardness.

How to Identify Mullite | Properties, Meaning & Uses

What is Mullite?

Mullite or porcelainite is a rare silicate mineral of post-clay genesis. It can form two stoichiometric forms: 3Al2O32SiO2 or 2Al2O3 SiO2. Unusually, mullite has no charge-balancing cations present. As a result, there are three different aluminium sites: two distorted tetrahedral and one octahedral. Mullite was first described in 1924 for an occurrence on the Isle of Mull, Scotland. It occurs as argillaceous inclusions in volcanic rocks in the Isle of Mull, inclusions in sillimanite within a tonalite at Val Sissone, Italy and with emerylike rocks in Argyllshire, Scotland.

Mullite Market Value Calculator

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

Mullite Localities Map

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