mineral

Milky quartz with iron staining

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent with pale pink and yellow-brown staining, vitreous to greasy luster, irregular granular/intergrown crystals, and no prominent cleavage. Specific gravity is about 2.65.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Likely a hydrothermal quartz vein or pegmatitic aggregate formed when silica-rich fluids crystallized in fractures, commonly during Precambrian to younger crustal events. The yellow-brown coloration is probably limonite/goethite staining, while pink areas may reflect inclusions or iron-related coloration.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, foundry materials, and electronics; attractive pieces are sold as cabinet specimens or occasionally carved. This rough specimen has modest decorative and collecting value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of many veins. Its lack of cleavage and conchoidal fracture help distinguish it from feldspar and calcite.

Field identification & locations

Identify it by its glassy appearance, translucent edges, hardness sufficient to scratch ordinary glass, and absence of cleavage; calcite would fizz in dilute hydrochloric acid. Common worldwide in quartz veins, pegmatites, and hydrothermal deposits.