mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous luster; hardness 7 Mohs, conchoidal fracture, no cleavage, hexagonal crystal structure, and specific gravity about 2.65. The specimen appears to be a rough, broken quartz fragment, though the image is not sufficient for certainty.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in cavities, veins, and pegmatites; deposits range from ancient Precambrian rocks to recent hydrothermal systems. It commonly occurs with feldspar, mica, and other vein minerals.

Uses & applications

Used in glass, ceramics, engineered stone, abrasives, and electronics; attractive clear or well-formed pieces are collected, while milky fragments generally have modest value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. Milky color results from microscopic fluid inclusions, fractures, or dispersed mineral impurities.

Field identification & locations

Common worldwide, including Brazil, the United States, Madagascar, and the Alps. Confirm with hardness testing against glass and inspection for conchoidal fracture; avoid scratching valuable specimens.