mineral

Quartz with Iron Oxide

SiO2

AI-generated identification · may be incorrect

Hardness: 7, Color: Clear to white with reddish-brown staining, Luster: Vitreous to greasy (when wet), Crystal structure: Hexagonal (though massive/tumbled here), Cleavage: None (conchoidal fracture), Specific gravity: 2.65

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich fluids precipitating in voids or veins in various rock types. The reddish coloration is due to iron oxide (hematite or limonite) staining or inclusions, often picked up during transport or weathering. Common as river or beach pebbles.

Uses & applications

Commonly tumbled for amateur collections or used in decorative landscaping.

Geological facts

Quartz is one of the most abundant minerals on Earth's surface. The staining on this piece is typical of quartz found in iron-rich environments or weathered soils.

Field identification & locations

Identified by its hardness (scratches glass) and glassy luster. Often found in riverbeds, beaches, and glacial till. Wetting the stone, as seen here, helps reveal its internal colors and structure.