mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, irregular conchoidal fracture, no cleavage, and hexagonal crystal structure. The rounded edges suggest natural weathering or tumbling.

Identified August 17, 2026More mineral →

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Physical properties

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, irregular conchoidal fracture, no cleavage, and hexagonal crystal structure. The rounded edges suggest natural weathering or tumbling.

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; specimens may range from Precambrian to recent. Commonly produced by hydrothermal activity or residual pegmatite formation.

Uses & applications

Used in glass, ceramics, engineered stone, electronics, abrasives, and countertop aggregate; attractive pieces are sold as inexpensive lapidary or decorative specimens.

Geological facts

Its cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and white streak. Common worldwide, especially in quartz veins, granites, pegmatites, and metamorphic terrains.