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Vesuvianite

Type Locality
Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy
Mineral Data
(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Strunz: 
9.BG.35
Physical Properties
Streak: 
White
Hardness: 
6.5
Tenacity: 
brittle
Synonyms
Synonyms: 
Vesuvian