mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, color typically white, clear, or milky, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, 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, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed in a wide variety of geological environments, commonly crystallizing from silica-rich hydrothermal veins and magma, as well as being a primary component of many igneous, metamorphic, and sedimentary rocks.
Uses & applications
Used widely in glassmaking, electronics, oscillators, gemstones, abrasive materials, and as a mineral specimen for collectors.
Geological facts
Quartz is one of the most abundant and widely distributed minerals on Earth's continental crust. Its piezoelectric properties make it essential in watches and electronic devices.
Field identification & locations
Easily identified by its distinct hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide.
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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
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral