mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale. Color ranges from colorless, white, grey, to various other hues depending on impurities. Luster is vitreous (glassy). Crystal system 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 ranges from colorless, white, grey, to various other hues depending on impurities. Luster is vitreous (glassy). Crystal system is trigonal. Conchoidal fracture with no true cleavage. Specific gravity is 2.65.
Formation & geological history
Forms in virtually all environments—igneous, metamorphic, and sedimentary rocks. It is a primary component of granite and sandstone, and frequently crystallizes from hydrothermal veins.
Uses & applications
Used in electronics, glassware, precision instruments, abrasive materials, gemstone carving, and metaphysical practices.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust, surpassed only by feldspar. Its piezoelectric properties make it essential for keeping time in watches.
Field identification & locations
Easily identified by its high hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide in nearly every geological setting.
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Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
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Septarian Pebble
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Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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