Quartz

Physical Properties

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).

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.

Identified on: 4/25/2026

Mode: Advanced