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Sérandite

Type Locality
Rouma Island (Roume Island; Roma Island; Ruma Island), Los Archipelago (Los Islands), Guinea
Mineral Data
Na(Mn2+,Ca)2(HSi3O9)
Strunz: 
9.DG.05
Physical Properties
Streak: 
White
Hardness: 
5.0 - 5.5
Tenacity: 
brittle
Synonyms
Synonyms: 
Serandite
Photos