mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with hematite/limonite inclusions

Hardness: 7 (Mohs scale); Color: Pinkish-orange to reddish-brown; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Pinkish-orange to reddish-brown
Luster: Vitreous to waxy

Identified April 11, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Pinkish-orange to reddish-brown; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal processes or within igneous rocks like granite. This specific rounded shape indicates water-worn weathering, likely from a riverbed or coastal environment. Common across all geological eras.

Uses & applications

Used primarily as decorative aggregate, in landscaping, or as a semi-precious gemstone. High-purity quartz is essential for making glass, semiconductors, and precision electronics.

Geological facts

The orange/pink hue is caused by microscopic iron oxide (rust) coating the surface or filling tiny internal fractures. Quartz is the most abundant mineral in Earth's continental crust.

Field identification & locations

Identify in the field by its hardness (it will scratch glass but cannot be scratched by a steel knife) and lack of cleavage. Found globally in almost any river or beach with silicates.

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