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Acuminite

Type Locality
Ivigtut Cryolite deposit, Ivittuut (Ivigtut), Arsuk Fjord, Sermersooq, Greenland
Mineral Data
Sr[AlF4(OH)(H2O)]
Strunz: 
3.CC.10
Physical Properties
Crystal System: 
Monoclinic
Streak: 
white
Hardness: 
3.5