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Derbylite

Type Locality
Tripuí (Tripuhy), Main district, Ouro Preto, Iron Quadrangle, Minas Gerais, Brazil
Mineral Data
Fe3+4Ti3Sb3+O13(OH)
Strunz: 
4.JB.55
Physical Properties
Crystal System: 
Monoclinic
Streak: 
Brown
Hardness: 
5.0
Tenacity: 
very brittle
Photos