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Tridymite

Type Locality
Cerro San Cristóbal, Mun. de Pachuca, Hidalgo, Mexico
Mineral Data
SiO2
Strunz: 
4.DA.10
Physical Properties
Crystal System: 
Triclinic - Pedial
Streak: 
White
Hardness: 
6.5 - 7.0
Tenacity: 
brittle
Photos