mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white with orange/brown iron oxide staining; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white with orange/brown iron oxide staining
Luster: Vitreous to greasy

Identified April 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes or igneous crystallization from silica-rich magma/fluids. This specimen appears water-worn or weathered, likely found in a riverbed or alluvial deposit.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as a common decorative or landscape stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear (Rock Crystal), but chemical impurities or surface staining like the iron oxide seen here can change its appearance significantly.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage (it breaks in irregular, curved shards). Look for it in riverbeds, mountain scree, or as veins in igneous rocks.