mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous to waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and trigonal crystal structure. The specimen appears massive and irregular, with possible iron-oxide staining or minor inclusions.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and fractures, or during cooling of silica-rich igneous rocks. Quartz is common from Precambrian to modern geological settings.

Uses & applications

Used in glassmaking, ceramics, electronics, abrasives, countertops, and ornamental collecting; attractive pieces may be used as lapidary material.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or mineral impurities scattering light. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it should not be confused with calcite, which is much softer. Common worldwide, especially in hydrothermal veins and granite-rich regions.