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Frondelite-Rockbridgeite Series

About

A series between Frondelite and Rockbridgeite, depending on substitution of Mn2+ (Frondelite) versus Fe2+ (Rockbridgeite)

Mineral Data
Series between, Mn2+Fe43+(PO4)3(OH)5 to Fe2+Fe43+(PO4)3(OH)5
Physical Properties
Crystal System: 
Orthorhombic