mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent to opaque yellow-orange; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Translucent to opaque yellow-orange
Luster: Vitreous to greasy

Identified June 30, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Translucent to opaque yellow-orange; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal solutions or cooling magma. This specimen shows water-worn rounding and yellow-orange iron oxide staining from environmental exposure.

Uses & applications

Common quartz is used in glass making, electronics (piezoelectric properties), and as an abrasive. Decorative pebbles are used in landscaping.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron-stained quartz is often mistaken for Citrine, which is a rare, naturally occurring yellow variety of quartz.

Field identification & locations

Found globally in riverbeds, beaches, and soil. To identify, check for its ability to scratch glass and its lack of cleavage. This specimen is a typical 'river rock' or 'tumble' find.