mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent white to tan/yellow with reddish iron staining; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Translucent white to tan/yellow with reddish iron staining
Luster: Vitreous to waxy

Identified June 6, 2026More mineral →

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Physical properties

Formation & geological history

Forms in a wide variety of environments, most commonly from the cooling of magma or by precipitation from hydrothermal veins. This specimen likely tumbled in a river or beach environment given its rounded shape.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as a gemstone or decorative stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear, but impurities like iron can create a wide spectrum of colors.

Field identification & locations

Identify by its hardness (it will scratch glass and steel), lack of cleavage, and translucent appearance. Commonly found in riverbeds, mountains, and as a primary component of many rocks like granite.