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Brookite

Type Locality
Twll Maen Grisial, Fron Olau, Prenteg, Gwynedd (Caernarvonshire), Wales, UK
Mineral Data
TiO2
Strunz: 
4.DD.10
Physical Properties
Crystal System: 
Orthorhombic
Hardness: 
5.5 - 6.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Brookit