mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Pale yellow to tan with orange/red iron staining; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); SG: 2.65

Hardness: 7 (Mohs scale)
Color: Pale yellow to tan with orange/red iron staining
Luster: Vitreous to greasy

Identified July 15, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Pale yellow to tan with orange/red iron staining; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); SG: 2.65

Formation & geological history

Forms in wide variety of geological environments including igneous veins, metamorphic rocks, and sedimentary deposits. This specimen appears to be a water-worn or weathered piece of vein quartz.

Uses & applications

Common quartz is used widely in glassmaking, grit/sandpaper, electronics (piezoelectric properties), and as decorative landscaping stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron-staining occurs when iron-rich water seeps into micro-cracks in the mineral, leaving behind hematite or limonite-colored layers.

Field identification & locations

Identify by its hardness (it will easily scratch glass) and its lack of cleavage. Found globally in river beds, beaches, and mountain trails. Collectors often look for iron-stained 'Golden Healer' varieties.