mineral

Milky quartz (iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, conchoidal fracture, no cleavage, and specific gravity about 2.65. The orange-beige coloration is likely iron-oxide staining or included iron-bearing minerals.

Identified September 10, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids or forms in igneous and metamorphic veins; individual specimens may be Precambrian to recent, depending on locality. This appears to be a naturally weathered, massive rather than well-crystallized piece.

Uses & applications

Used extensively in glass, ceramics, abrasives, foundry materials, electronics, and engineered stone; attractive pieces are sold as inexpensive mineral specimens or lapidary rough.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the principal component of many veins and quartzites. It commonly preserves conchoidal, shell-like fracture surfaces.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and white streak; iron staining produces yellow, orange, or brown patches. Common worldwide, especially in hydrothermal veins and pegmatites.