mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster, granular texture, and no visible cleavage; Mohs hardness 7, specific gravity about 2.65, with hexagonal crystal structure. The specimen appears rough, massive, and naturally weathered.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; its broad age range depends on the host formation, commonly Precambrian to younger. The cloudy appearance results from microscopic fluid inclusions or structural defects.

Uses & applications

Used for countertops, glass and ceramics, abrasives, and industrial silica; attractive pieces are sold as inexpensive cabinet specimens or occasionally carved ornaments.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge when mechanically stressed.

Field identification & locations

Identify by its glassy appearance, hardness, lack of cleavage, and ability to scratch ordinary glass; common localities include Brazil, Madagascar, the United States, and quartz veins worldwide. A definitive distinction from calcite can be made because quartz does not fizz in dilute acid and is much harder.