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Hillebrandite

Type Locality
Terneras Mine, Velardeña, Velardeña District, Mun. de Cuencamé, Durango, Mexico
Mineral Data
Ca2(SiO3)(OH)2
Strunz: 
9.DG.40
Physical Properties
Streak: 
White
Hardness: 
5.0 - 5.5
Tenacity: 
brittle