mineral

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to white/milky; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to white/milky
Luster: Vitreous (glassy)

Identified March 20, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless to white/milky; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of molten magma or from hydrothermal veins. It is found in igneous, metamorphic, and sedimentary environments across all geological ages, from the Precambrian to the present.

Uses & applications

Used extensively in glass making, electronics (piezoelectric properties), abrasives, construction (as river rock or sand), and as a semi-precious gemstone in jewelry and metaphysical collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is a 'piezoelectric' material, meaning it generates an electric charge when mechanical stress is applied, a property used in watches and radios.

Field identification & locations

Identify in the field by its hardness (it will scratch glass and steel), lack of cleavage, and waxy to glassy appearance when weathered. This specimen appears to be a water-worn or tumbled pebble commonly found in riverbeds or coastal areas.

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