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Ussingite

Type Locality
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland
Mineral Data
Na2AlSi3O8OH
Strunz: 
9.EH.20
Physical Properties
Crystal System: 
Triclinic
Streak: 
white
Hardness: 
6.0 - 7.0
Tenacity: 
brittle