mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous luster, uneven conchoidal fracture, and no visible cleavage; Mohs hardness 7, specific gravity about 2.65. The specimen appears chipped or naturally broken, with minor surface inclusions.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids and commonly occurs in veins, pegmatites, and metamorphic rocks. Its formation age cannot be determined from the image and may range from recent vein growth to Precambrian host-rock events.

Uses & applications

Common quartz is used in glass, ceramics, engineered stone, abrasives, and electronics; attractive pieces are collected or used in cabochons and decorative objects.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or dispersed defects that scatter light. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify it by hardness, glassy luster, conchoidal fracture, and lack of cleavage; it should scratch ordinary window glass. Common worldwide, especially in quartz veins and granitic terrains.