mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-greasy luster, hardness 7 Mohs, specific gravity about 2.65, and no cleavage; it shows conchoidal fracture and a massive, microcrystalline texture. The specimen appears rough and naturally fractured rather than crystalline.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or igneous fluids precipitate quartz in veins and cavities, commonly in granitic and metamorphic terrains. Quartz is geologically widespread and forms from Precambrian through modern times.

Uses & applications

Used for glass, engineered stone, ceramics, electronics, abrasives, and limited ornamental carving; milky pieces are generally inexpensive collector specimens.

Geological facts

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

Field identification & locations

Identify it by its white translucency, glassy sheen, lack of cleavage, and ability to scratch ordinary glass; a steel knife will not scratch it. Common worldwide, especially in quartz veins, granites, pegmatites, and metamorphic rocks.