Properties of Sodalite

Sodalite is a blue-colored mineral that typically forms in igneous rocks. It belongs to the group of feldspathoid minerals and is composed of sodium aluminum silicate chloride.

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Image of sodalite mineral
Credit: James St. John, CC BY 2.0, via Wikimedia Commons

The following table provides a comprehensive list of sodalite properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).

Note: click on the button to switch between Metric and Imperial units.

Table of Sodalite Properties
Physical Properties
Metric
Chemical FormulaNa8(Al6Si6O24)Cl2
Molar Mass933.76 g/mol
Crystal SystemCubic
Mohs Hardness5.5 - 6
Density2270 - 2330 kg/m3
ColorAzure blue, white, yellow, pale pink, colorless, gray, or green
DiaphaneityTransparent to translucent
LusterVitreous (glassy), greasy
Cleavage(110) good
FractureConchoidal
StreakWhite
Optical PropertiesMetric
Refractive Index (nD)1.483 - 1.487

Note: unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)

Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017.