mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Transparent to brownish-orange (due to iron oxide staining). Luster: Vitreous (glassy). Crystal Structure: Hexagonal/Trigonal. Cleavage: Indistinct/Conchoidal fracture. Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Transparent to brownish-orange (due to iron oxide staining)
Luster: Vitreous (glassy)

Identified May 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in veins or cavities within various rock types. The orange-brown crust is a result of secondary iron oxide (limonite or hematite) coating.

Uses & applications

Used in glass making, electronics (piezoelectric properties), abrasives, and as decorative collector specimens.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. This specific specimen shows 'druzy' or crystalline growth that has been stained by groundwater weathering.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage (it breaks like glass). It is commonly found in gravel pits, mountain ranges, and near volcanic activity. Collectors look for well-defined crystal points.