IMA mineral species

Sanidine

KAlSi₃O₈

Feldspar, tectosilicate mineral.

Sanidine specimen — Sanidine-477065.jpg · Wikimedia Commons (see file page for author & license)

Properties

Chemical formula	KAlSi₃O₈
Elements	K, Al, Si, O
Crystal system	Monoclinic
Mohs hardness	6
Density	2.457 g/cm³
Streak	white
Color	—
IMA symbol	Sa
Nickel–Strunz class	9.FA.30

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

🌍 Where it's found

Type locality (where it was first described): Drachenfels, Germany

Type locality
Notable source / deposit
Country of origin

Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.

Varieties & related stones

Anorthoclase

Learn more

Sanidine on Mindat.org
Wikipedia article
Wikidata item Q426723 (source of this page's data – you can correct it there)