mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, vitreous to greasy luster, white or colorless with possible brownish staining (iron oxides), conchoidal fracture, no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to greasy luster, white or colorless with possible brownish staining (iron oxides), conchoidal fracture, no true cleavage, specific gravity of 2.65.
Formation & geological history
Forms in a wide variety of geological environments, including igneous, metamorphic, and sedimentary rocks. Often crystallizes from silica-rich hydrothermal veins and pegmatites.
Uses & applications
Used extensively in glassmaking, electronics, oscillators, abrasives, gemstones, and ornamental items.
Geological facts
Quartz is one of the most abundant and widely distributed minerals found on Earth's continental crust. Its piezoelectric properties make it essential in modern electronics.
Field identification & locations
Easily identified by its hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide in nearly every geological setting.
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