mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, transparent to translucent, 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, transparent to translucent, 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. It crystallizes from silica-rich melts and hydrothermal solutions.
Uses & applications
Used in electronics, watches, glassmaking, abrasives, and as a gemstone or tumbled stone in jewelry and lapidary work.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust, after feldspar. It exhibits piezoelectric properties, meaning it can generate an electrical charge in response to applied mechanical stress.
Field identification & locations
Can be identified by its conchoidal fracture, lack of cleavage, and hardness (scratches glass easily). Found worldwide in almost all rock types.
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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
Schist
Schist
Metamorphic
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral