mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, clear to white color (can be various colors depending on impurities), vitreous luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, clear to white color (can be various colors depending on impurities), vitreous luster, trigonal crystal system, conchoidal fracture, 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 in glassmaking, electronics, oscillators, abrasives, gemstones, and ornamental objects.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electric charge in response to mechanical stress.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide.
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Arenite (SiO2 based)
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Limonite / Goethite (Iron Ore Mineral nodule)
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Schist
Schist
Metamorphic
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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