mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Milky white with orange-yellow iron staining
Luster: Vitreous to greasy

Identified April 5, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. Often found in various geological environments ranging from igneous to metamorphic terrains.

Uses & applications

Used widely in glass making, electronics (oscillators), abrasives, construction aggregates, and as gemstones or collector specimens.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The yellow-orange tint in this specimen is likely due to 'Limonite' or iron oxide coatings on the surface or within fractures.

Field identification & locations

Identify by its ability to scratch glass and steel, lack of cleavage, and characteristic glassy luster. Commonly found in riverbeds, gravel pits, and mountain ranges globally.