Ussingite
(repeating unit)Na2AlSi3O8OH IMA symbol Usg[1] Strunz classification 9.EH.20 Crystal system Triclinic Crystal class Pinacoidal (1)
(same H-M symbol) Space group P1 Identification Color pale to medium violet, reddish violet; sometimes barely tinted purple Fracture irregular/ uneven Tenacity brittle Mohs scale hardness 6–7 Luster sub-vitreous Streak white Diaphaneity transparent, translucent References [2][3]
(same H-M symbol)
Ussingite is a silicate mineral with formula Na2AlSi3O8(OH).[4]
It was named for Niels Viggo Ussing (1864–1911), Copenhagen, Denmark.
References
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