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Alleghanyite

Type Locality
Bald Knob, Sparta, Alleghany County, North Carolina, United States of America
Mineral Data
Mn2+5(SiO4)2(OH)2
Strunz: 
9.AF.45
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
5.5
Tenacity: 
brittle