IMA mineral species

Laumontite

CaAl₂Si₄O₁₂·4H₂O

Zeolite mineral.

Yellow Brown White & Clear

Laumontite specimen — Prehnite-Laumontite-132299.jpg · Wikimedia Commons (see file page for author & license)

Properties

🔷 Monoclinic

Chemical formula	CaAl₂Si₄O₁₂·4H₂O
Elements	Ca, Al, Si, O, H
Crystal system	Monoclinic
Mohs hardness	—
Density	—
Streak	—
Color	—
IMA symbol	Lmt
Nickel–Strunz class	9.GB.10

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

🌍 Where it's found

Type locality (where it was first described): Huelgoat, France

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

Leonhardite

Learn more

Laumontite on Mindat.org
Wikipedia article
Wikidata item Q389444 (source of this page's data – you can correct it there)