mineral

Milky quartz crystal

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous luster, conchoidal fracture, and no cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. The specimen appears naturally fractured or partially crystal-shaped, with milky inclusions.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or igneous melts crystallize in veins, cavities, and pegmatites. Quartz is common from Precambrian to modern geological settings; its exact age cannot be determined visually.

Uses & applications

Used for glass, ceramics, abrasives, electronics, and engineered stone; attractive crystals are collected or used decoratively, though this piece appears modest commercial grade.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, generating an electrical charge under pressure.

Field identification & locations

Identify it by its glassy luster, hardness sufficient to scratch ordinary glass, lack of cleavage, and white translucent appearance; common worldwide, especially in quartz veins and pegmatites.