mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent with orange/brown surface staining; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent with orange/brown surface staining
Luster: Vitreous (glassy) to greasy

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in veins or as a major constituent of igneous rocks. The orange coloration comes from secondary oxidation (limonite/hematite staining) over geological time.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, and as decorative gravel. Higher quality specimens are used for jewelry and lapidary art.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron-stained quartz like this is often referred to by prospectors as 'blossom rock' or 'gossan', sometimes indicating the presence of gold nearby.

Field identification & locations

Identify in the field by its ability to scratch glass (hardness 7) and its lack of cleavage. Look for the 'sugary' or glassy texture on fresh breaks. Found globally in riverbeds, mountains, and soil.