mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, massive and coarsely crystalline with a vitreous to dull luster; Mohs hardness 7, trigonal crystal system, no cleavage, and conchoidal fracture. The specimen appears to be an irregular mass of milky quartz, possibly with minor mineral staining or inclusions.

Identified October 6, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in fractures and veins, or during cooling of silica-rich melts; quartz is found in rocks of many geological ages. The image alone cannot establish the specimen’s age or precise formation setting.

Uses & applications

Commonly used as a silica source in glass and industrial materials; attractive pieces are collected or used for ornamental objects and lapidary work.

Geological facts

Its cloudy appearance results from microscopic fluid or gas inclusions and structural defects that scatter light.

Field identification & locations

Identify it by its hardness, glassy fracture, lack of cleavage, and pale opaque appearance; it occurs worldwide in veins, pegmatites, and many rock types. Estimated value: about $2–$20 for a common rough specimen of this size, depending on quality and provenance.