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Allactite

Type Locality
Moss mine, Nordmark (Nordmarksberg), Filipstad, Värmland, Sweden
Mineral Data
Mn2+7(AsO4)2(OH)8
Strunz: 
8.BE.30
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
4.5
Tenacity: 
brittle
Synonyms
Synonyms: 
Allaktite