mineral
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to off-white with tan iron staining, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to off-white with tan iron staining, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed through the cooling of magma or hydrothermal activity in veins. It is found in igneous, sedimentary, and metamorphic environments. This specific specimen appears to be a worn piece of vein quartz or quartzite.
Uses & applications
Used widely in glassmaking, ceramics, electronics (piezoelectric properties), and as a common construction aggregate. Decorative versions are used in jewelry and lapidary arts.
Geological facts
Quartz is the most abundant and widely distributed mineral found at Earth's surface. The milky white color is caused by microscopic inclusions of gas or liquid trapped during crystal formation.
Field identification & locations
Identify in the field by its hardness (it will scratch glass easily) and its lack of cleavage. It is ubiquitous in riverbeds, mountains, and gardens worldwide.
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Schist
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Mineral
Epidote
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