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Groutite

Type Locality
Sagamore Mangan No. 2 pit, Ironton, Cuyuna North Range, Crow Wing Co., Minnesota, USA
Mineral Data
Mn3+O(OH)
Strunz: 
4.FD.10
Physical Properties
Hardness: 
3.5 - 4.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Groutit
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