mineral

Quartz

Silicon dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Generally white, clear, or cloudy, with pinkish or brownish iron oxide staining in this specimen. Luster: Vitreous (glassy). Crystal structure: Hexagonal. Cleavage: None (conchoidal fracture).

Hardness: 7 on Mohs scale
Luster: Vitreous (glassy)

Identified April 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms in a wide variety of geological environments, crystallizing from silica-rich magma or precipitating from hydrothermal solutions. Highly abundant in the Earth's continental crust.

Uses & applications

Used in glassmaking, electronics (as oscillators due to piezoelectricity), construction materials, and as a semi-precious stone in jewelry or lapidary arts depending on the variety.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust, after feldspar. The reddish/pinkish staining seen in this piece is likely due to hematite or other iron oxide inclusions.

Field identification & locations

Easily identified by its hardness (scratches glass), glassy luster, and lack of cleavage. Often found as massive chunks or veins in metamorphic and igneous rocks.