mineral

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), with limonite/goethite staining

AI-generated identification · may be incorrect

Typically white to translucent, vitreous to waxy luster, uneven fracture, and no cleavage; Mohs hardness 7 and specific gravity about 2.65. The rusty orange-brown patches are iron oxides, while gray areas may reflect inclusions or weathering.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich hydrothermal fluids in veins, cavities, and fractures of older igneous or metamorphic rocks; its age depends on the host formation and may range from Precambrian to recent. Surface weathering produced the iron staining.

Uses & applications

Used as a decorative and landscaping stone, silica source, and collectible specimen; attractive translucent pieces may be cut or polished, though this example appears ordinary rather than gem quality.

Geological facts

Milky quartz gets its opacity from microscopic fluid inclusions, fractures, or mineral impurities. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify it by its glassy appearance, hardness sufficient to scratch ordinary steel or glass, lack of cleavage, and conchoidal/uneven fracture; common worldwide in quartz veins and gravel. Value is usually about $5–$20 for a common hand specimen, or $20–$100 if unusually clear, large, or well formed.