IMA mineral species

Celsian

BaAl₂Si₂O₈

Feldspar, mineral.

Yellow White & Clear

Celsian specimen — Celsian in sanbornite004.jpg · Wikimedia Commons (see file page for author & license)

Properties

Chemical formula	BaAl₂Si₂O₈
Elements	Ba, Al, Si, O
Crystal system	Monoclinic
Mohs hardness	—
Density	3.338 g/cm³
Streak	—
Color	—
IMA symbol	Cls
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): Jakobsberg mine, Sweden

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

Hyalophane

Learn more

Celsian on Mindat.org
Wikipedia article
Wikidata item Q429534 (source of this page's data – you can correct it there)