IMA mineral species

Jakobssonite

CaAlF₅

Halide mineral.

Jakobssonite specimen — Verneite, Jakobssonite-933903.jpg · Wikimedia Commons (see file page for author & license)

Properties

⚖ Density2.945 g/cm³

Average

🔷 Monoclinic

Chemical formula	CaAlF₅
Elements	Ca, Al, F
Crystal system	Monoclinic
Mohs hardness	—
Density	2.945 g/cm³
Streak	—
Color	—
IMA symbol	Jak

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

🌍 Where it's found

Type locality (where it was first described): Hekla, Iceland · Eldfell, Iceland

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.

Learn more

Jakobssonite on Mindat.org
Wikidata item Q19860853 (source of this page's data – you can correct it there)