mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, color typically white, clear, or milky, 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, color typically white, clear, or milky, vitreous luster, hexagonal 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 crystallizing from silica-rich hydrothermal veins and pegmatites
Uses & applications
Used extensively in electronics, glassmaking, abrasives, gemstones, and decorative items
Geological facts
Quartz is one of the most abundant and widely distributed minerals found on Earth's continental crust
Field identification & locations
Easily identified by its hardness (scratches glass), lack of cleavage, and conchoidal fracture; found worldwide
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Arenite (SiO2 based)
sedimentary
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Regolith / Silicate Mineral Aggregate
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Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
mineral
Schist
Schist
Metamorphic
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral