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Barwoodite

Type Locality
Big Rock Quarry, Pulaski County, Arkansas, United States of America
Mineral Data
Mn2+6Nb5+(SiO4)2O3(OH)3
Physical Properties
Colour: 
Brownish red
Crystal System: 
Trigonal
Streak: 
Light orange
Hardness: 
Tenacity: 
Brittle
Synonyms
Synonyms: 
IMA2017-046