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Quartz

Quartz is a hard, crystalline mineral composed of silica. The atoms are linked in a continuous framework of SiO₄ silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO₂. Wikipedia
Chemical formula: SiO2
Category: Silicate mineral
Cleavage: Indistinct
Color: Colorless through various colors (pink, orange, purple, dark brown) to black
Crystal class: α-quartz: trapezohedral (class 3 2); β-quartz: trapezohedral (class 6 2 2)
Crystal system: α-quartz: trigonal; β-quartz: hexagonal
Fracture: Conchoidal

Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra ...
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Quartz is one of the most common minerals in the Earth's crust. As a mineral name, quartz refers to a specific chemical compound (silicon dioxide, or.
Quartz is one of the most common minerals found in the Earth's crust. If pure, quartz forms colorless, transparent and very hard crystals with a glass-like ...
Quartz crystal habits include drusy, grainy, bladed, as linings of geodes, as rounded waterworn pebbles, radiating, as pointy pyramids on a matrix, as dense ...
Quartz is our most common mineral. Quartz is made of the two most abundant chemical elements on Earth: oxygen and silicon. Atoms of oxygen and silicon join ...