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Ilvaite

Type Locality
Torre di Rio - Santa Filomena area (Monte della Torre), Rio Marina, Elba Island, Livorno Province, Tuscany, Italy
Mineral Data
CaFe2+2Fe3+(Si2O7)O(OH)
Strunz: 
9.BE.07
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Lievrite