mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white or colorless, 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, typically white or colorless, 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, frequently crystallizing from silica-rich hydrothermal solutions or cooling magma, as well as accumulating in sedimentary environments through weathering.
Uses & applications
Used extensively in electronics, glassmaking, precision instruments, gemstones, and abrasive materials.
Geological facts
Quartz is one of the most abundant and widely distributed minerals found on Earth's continental crust, and exhibits piezoelectric properties.
Field identification & locations
Easily identifiable by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found worldwide in nearly all rock types.
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Arenite (SiO2 based)
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Schist
Schist
Metamorphic
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral