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 structure is 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 structure is trigonal. Conchoidal fracture with no true cleavage. Specific gravity is 2.65.
Formation & geological history
Forms in a wide variety of geological environments, including igneous, metamorphic, and sedimentary rocks. It is a common constituent of pegmatites, hydrothermal veins, and sandstones.
Uses & applications
Used widely in glassmaking, electronics, oscillators, abrasives, and as gemstones or decorative specimens in jewelry and collecting.
Geological facts
Quartz is one of the most abundant minerals found in the Earth's continental crust. Its piezoelectric properties make it useful in electronic timing devices.
Field identification & locations
Easily identified in the field by its hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide in almost all rock types.
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Septarian Pebble
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Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral