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.
Hardness:
6 - 7
Density:
3.17 g/cm³
On This Page
Properties
Characteristics
Common Questions
General Info About Mullite
Instantly Identify Rocks with a Snap
Snap a photo for instant rock/gemstone/mineral ID and properties analysis, gaining quick insights on characteristics, market value, collecting tips, care, real vs fake, and health risks, etc.
Download the App for Free
Physical Properties of Mullite
Colors
Colourless, white, yellow, pink, red, gray
Hardness
6 - 7 , Hard
Density
3.17 g/cm³, Normal Weight
AI rock expert in your pocket
Chemical Properties of Mullite
Formula
Al4+2xSi2-2xO10-x
(x ~ 0.4)
Elements listed
Al, O, Si
Common Impurities
Ti,Fe,Na,K
Characteristics of Mullite
Your Comprehensive Rock Characteristics Guide
In-depth exploration of rock types, features, and formation aspects
Download the App for Free
Common Questions People Also Ask
Get Quick Rock Answers with a Snap
Snap a photo for instant rock ID and answers on characteristics, market value, collecting tips, care, real vs fake, and health risks, etc.
Download the App for Free
Get Rock Identifier now
Try out Rock Identifier app on your phone and identify thousands of rocks for free
Learn more info about rocks from our rich and growing database.
Scan QR code to download
Get Rock Identifier now
Try out Rock Identifier app on your phone and identify thousands of rocks for free
Learn more info about rocks from our rich and growing database.