Rock Identifier
Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral
mineral

Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Variable (clear, pink/orange, pale green/yellow seen here); Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness
7 on Mohs scale
Color
Variable (clear, pink/orange, pale green/yellow seen here)
Luster
Vitreous (glassy)
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Physical properties

Hardness: 7 on Mohs scale; Color: Variable (clear, pink/orange, pale green/yellow seen here); Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Forms in a wide variety of environments, most commonly by cooling from molten rock (igneous) or precipitating from hot hydrothermal veins. It can be found in rocks from virtually all geological ages.

Uses & applications

Used extensively in glass manufacturing, electronics (due to piezoelectric properties), construction as an abrasive, and as gemstones in jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. These specific specimens appear to be water-worn pebbles, likely collected from a river or beach.

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage. Common in riverbeds and mountainous terrain globally.

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