mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white to clear color, vitreous luster, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, white to clear color, vitreous luster, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Formed in a wide variety of geological environments, frequently crystallizing from silicate-rich magmas and hydrothermal veins, as well as precipitating in sedimentary environments
Uses & applications
Used in electronics, watches, glassmaking, abrasives, and as gemstones or decorative specimens
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electrical charge under mechanical stress
Field identification & locations
Easily identified by its hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found worldwide in nearly every rock type
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Schist
Schist
Metamorphic
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral