mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a glassy-to-waxy luster and irregular fracture; hardness 7 Mohs, no cleavage, and specific gravity about 2.65. The specimen appears massive and granular, with minor gray or brown inclusions and no obvious crystal faces.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and pegmatites, or as a component of igneous and metamorphic rocks. Quartz is geologically widespread and ranges from ancient Precambrian material to recent vein deposits.

Uses & applications

Used in glassmaking, ceramics, foundry sand, electronics, abrasives, and engineered stone; attractive translucent pieces are collected or polished, though this specimen is not gem grade.

Geological facts

Its cloudy appearance results from microscopic fluid inclusions, fractures, or dispersed minerals rather than a separate mineral species. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Common in hydrothermal veins, pegmatites, granite, metamorphic rocks, and river gravels worldwide. It can scratch ordinary glass and steel, has no cleavage, and commonly leaves a white streak; acid produces no reaction.