mineral

Milky quartz

Quartz (SiO₂)

AI-generated identification · may be incorrect

White to translucent, glassy to dull luster, with irregular conchoidal fractures and no cleavage; Mohs hardness 7, hexagonal crystal structure, specific gravity about 2.65. The small specimen’s appearance is consistent with quartz, though identification from the image is not definitive.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins and cavities, commonly during igneous or metamorphic activity; quartz is found in rocks of many geological ages.

Uses & applications

Used as a silica source in glass and ceramics, and as an inexpensive ornamental or lapidary material.

Geological facts

Quartz is one of Earth’s most abundant minerals and can persist through repeated weathering because it is relatively hard and chemically durable.

Field identification & locations

Look for hardness sufficient to scratch ordinary glass and the absence of cleavage; common worldwide in veins, granites, and river gravels. Value depends on size, clarity, and workmanship.