mineral

Milky quartz vein rock

Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor mica or sulfide minerals

AI-generated identification · may be incorrect

White to translucent, massive quartz with vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, hexagonal crystal structure. Yellow-brown coloration is mainly limonite/goethite staining; the darker granular matrix may be altered host rock or mica-rich material.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich hydrothermal fluids filled fractures in surrounding rock and crystallized, commonly during mountain-building or igneous activity. The exact age cannot be determined from the photograph and depends on its host geology.

Uses & applications

Used as a source of silica, in glass and ceramics, aggregate, and occasionally ornamental stone; attractive pieces are collected but this specimen appears common rather than gem grade.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing quartz veins to persist after their host rocks erode.

Field identification & locations

Identify it by its glassy appearance, hardness—scratching ordinary glass—and lack of cleavage; iron staining produces the rusty yellow tones. Common in hydrothermal veins worldwide, including the Appalachian, western U.S., Brazilian, and Australian regions.