mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, vitreous to greasy luster, transparent to translucent, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to greasy luster, transparent to translucent, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks. Commonly crystallizes from silica-rich hydrothermal solutions or cooling magma.
Uses & applications
Used in electronics (oscillators), glass manufacturing, abrasives, gemstones, and ornamental objects.
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
Identified by its high hardness (scratches glass easily), lack of cleavage, and conchoidal fracture. Found worldwide in nearly all rock types.
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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)
mineral