IMA mineral species

Ussingite

Na₂AlSi₃O₈(OH)

Transitional structure between phyllosilicate and other silicate unit, mineral.

RedPurple

Ussingite specimen
Ussingite, Vuonnemite-294589.jpg · Wikimedia Commons (see file page for author & license)

Properties

⚖ Density2.423 g/cm³
Average
🔷 Triclinic✏️ streak white
Chemical formulaNa₂AlSi₃O₈(OH)
ElementsNa, Al, Si, O, H
Crystal systemTriclinic
Mohs hardness—
Density2.423 g/cm³
Streakwhite
Color—
IMA symbolUsg
Nickel–Strunz class9.EH.20

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

🌍 Where it's found

Type locality (where it was first described): Kangerluarsuk fjord, Ilímaussaq, Greenland