mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, with irregular fracture and no cleavage; Mohs hardness 7 and specific gravity about 2.65. The specimen appears to be a massive, intergrown quartz piece; crystal form is trigonal, though individual crystals are not evident.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins and cavities, or during cooling of silica-rich magma. Quartz occurs in rocks of many ages; this specimen’s age and exact geological setting cannot be determined from the image.

Uses & applications

Commonly used as a silica source in glassmaking and industry; attractive pieces are used for carving, décor, and mineral collections.

Geological facts

Milky appearance results from tiny fluid or gas inclusions and microscopic defects that scatter light.

Field identification & locations

Look for glassy surfaces, hardness sufficient to scratch ordinary glass, and lack of cleavage; common worldwide in quartz veins and pegmatites. The image supports a quartz identification, but the specimen’s precise source is unknown.