mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, irregular fracture, and no obvious cleavage. It has a trigonal crystal structure, though this specimen appears massive and rough rather than well-crystallized.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids or magmas crystallize in veins, cavities, and igneous or metamorphic rocks. Quartz is extremely widespread and ranges from Precambrian to modern geological settings.

Uses & applications

Used in glass, ceramics, electronics, abrasives, countertops, and construction aggregate; attractive pieces are collected or used decoratively. This rough specimen has modest commercial value.

Geological facts

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

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and alpine environments. Identify it by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary steel or glass.