IMA mineral species

Sillimanite

Al₂OSiO₄

Nesosilicate mineral.

Yellow Green Teal Blue Brown Gray White & Clear

Sillimanite specimen — SillimaniteUSGS.jpg · Wikimedia Commons (see file page for author & license)

Properties

Chemical formula	Al₂OSiO₄
Elements	Al, O, Si
Crystal system	Orthorhombic
Mohs hardness	7
Density	3.677 g/cm³
Streak	white
Color	—
IMA symbol	Sil
Nickel–Strunz class	9.AF.05

“—” means no reliable value in Wikidata yet. Check Mindat for full data.

Learn more

Sillimanite on Mindat.org
Wikipedia article
Wikidata item Q119632 (source of this page's data – you can correct it there)