M E N U « Home | Browse Minerals | QuizzesMinerals by letter: All | K | G | O | A | H | T | P | C | Q | N | Z | S | E | W | M | B | F | D | L Minerals by class: Silicates | Halides | Carbonates | Sulfates | Oxides | Phosphates | Hydroxides | Native elements | Sulfides Silicate Subclasses: Nesosilicates | Pyroxenes | Amphiboles | Frameworks | Sorosilicates | Cyclosilicates | Phyllosilicates    « Back to minerals starting with T T O P A Z Click for expanded view TopazAl2SiO4(F,OH)2 Class: Silicate Hardness: 8 Density: 3.5 Streak: White Lustre: Glassy Habit: Prismatic crystals Colours: Almost brownish, any colour    Crystal System: Orthorhombic Cleavage: Perfect Fracture: Subconchoidal Magnetism: None Reaction with HCl: None Identification in hand sample: Resembles quartz, but harder. Associations: Quartz Industrial / ecomonic uses: Gemstone Comments: Forms most commonly in pegmatites.    Inaccurate data? Better photos? .

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