mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous to dull luster, irregular fracture, and no visible cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The specimen’s rough, opaque appearance is consistent with common milky quartz.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins and cavities, or as grains in igneous and metamorphic rocks. Quartz is common in rocks of many geological ages; the specimen’s age and precise origin cannot be determined from the image.

Uses & applications

Used as a silica source in glass and industrial products; attractive pieces are collected or used in crafts and inexpensive jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and its hardness lets it scratch ordinary glass.

Field identification & locations

Look for hardness near 7, lack of cleavage, and a glassy or uneven fracture; quartz occurs worldwide in veins, pegmatites, and many rock types. A small, common rough piece like this is typically worth about $1–$5.