M E N U « Home | Browse Minerals | QuizzesMinerals by letter: All | A | B | C | D | E | F | G | H | K | L | M | N | O | P | Q | S | T | W | Z Minerals by class: Carbonates | Halides | Hydroxides | Native elements | Oxides | Phosphates | Silicates | Sulfates | Sulfides Silicate Subclasses: Amphiboles | Cyclosilicates | Frameworks | Nesosilicates | Phyllosilicates | Pyroxenes | Sorosilicates    « 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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