mineral

Quartz chunk

Silicon dioxide (SiO2)

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

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

Identified May 29, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of magma or by precipitation from hydrothermal veins. It is one of the most abundant minerals in the Earth's crust and can be found in igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & applications

Used widely in glass making, electronics (due to piezoelectric properties), abrasives, and as a gemstone or decorative specimen.

Geological facts

Quartz is highly resistant to both chemical and physical weathering. It is the primary component of most beach sand. Famous varieties include amethyst, citrine, and rose quartz.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), glassy luster, and lack of cleavage. This small specimen is likely a piece of milky quartz or a small crystal fragment common in gravel and soil.