Minerale caratterizzato da un colore blu scuro con sfumature viola, lucentezza vitrea, frattura sub-concoide, sfaldatura solitamente non distinguibile, tenacità fragile, traslucido. Abito cristallino massivo.
ZONA DI PROVENIENZA
NAZIONE DI PROVENIENZA
Brasile
ORIGINE
Minerale presente in rocce intrusive alcaline, in pegmatiti alcaline, in carbonatiti, in rocce calcaree metasomatizzate, in materiali eruttati dai vulcani, fonoliti, sieniti, basalti, tefriti.
USI
Minerale utilizzato in gioielleria, come pietra decorativa in architettura, e nella realizzazione di oggetti artistici.
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