mineral

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 (Mohs scale); Color: White, translucent, with orange/yellow iron oxide staining; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, translucent, with orange/yellow iron oxide staining
Luster: Vitreous to waxy

Identified June 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specimen likely came from a hydrothermal quartz vein where iron-rich waters permeated cracks, leaving behind goethite or limonite stains.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, and as a gemstone or collector's item.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear, but tiny fluid inclusions during formation create the 'milky' white appearance seen in this specimen.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. It is extremely common in riverbeds, mountain ranges, and gravel pits globally. Collectors look for well-defined crystal faces which this specimen lacks.

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