Properties of Kyanite

Kyanite is a mineral that is typically blue, although it can also be colorless, white, gray, green, or yellow. It is an aluminum silicate mineral with the chemical formula Al2SiO5.

Image of kyanite mineral
Credit: Rob Lavinsky, iRocks.com - CC-BY-SA-3.0, via Wikimedia Commons

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

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

Table of Kyanite Properties
Physical Properties
Metric
Chemical FormulaAl2SiO5
Molar Mass162.0456 g/mol
Crystal SystemTriclinic
Mohs Hardness6.3
Density3530 - 3650 kg/m3
ColorBlue, white, yellowish, gray, green, or black
DiaphaneityTranslucent to transparent
LusterVitreous (glassy), pearly
Cleavage(100) perfect, (010) imperfect
FractureUneven, brittle
StreakWhite

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.