mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Clear to white with orange/yellow iron oxide staining; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Clear to white with orange/yellow iron oxide staining
Luster: Vitreous to waxy

Identified June 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specific specimen appears to be a water-worn or weathered pebble that has absorbed iron hydroxides (like goethite or limonite) into its surface cracks over time.

Uses & applications

Primarily used in glassmaking, electronics (piezoelectric properties), and as an abrasive. Decorative or iron-stained pebbles are sometimes used in landscaping or as low-value collector items.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. The yellow-orange tint on this specimen is not the color of the quartz itself, but a microscopic layer of 'rust' or iron oxide coating the surface.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and glacial till. For collectors, look for the 'conchoidal' (shell-like) fracture patterns on broken edges.