mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale. Color is typically white or colorless, but can vary. Luster is vitreous (glassy). Crystal system is hexagonal (trigonal). Conchoidal fracture with no true cleavage. Specific gravity is 2.65.
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Physical properties
Hardness of 7 on the Mohs scale. Color is typically white or colorless, but can vary. Luster is vitreous (glassy). Crystal system is hexagonal (trigonal). Conchoidal fracture with no true cleavage. Specific gravity is 2.65.
Formation & geological history
Forms in a wide variety of geological environments, most commonly as a primary mineral in felsic igneous rocks like granite, in hydrothermal veins, and as detrital grains in sedimentary rocks like sandstone.
Uses & applications
Used in electronics, oscillators, glassmaking, abrasives, gemstone carvings, and countertops.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electric charge in response to applied mechanical stress.
Field identification & locations
Easily identified by its hardness (scratches glass), glassy luster, and lack of cleavage. Found worldwide in nearly every type of rock environment.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
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)
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