mineral

Milky quartz cluster

Quartz (silicon dioxide, SiO₂), likely a massive-to-drusy specimen with possible mica inclusions

AI-generated identification · may be incorrect

Typically white to translucent with vitreous to pearly luster; Mohs hardness 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. The glittering silvery areas may be muscovite or reflective fracture surfaces.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Quartz precipitates from silica-rich hydrothermal fluids in veins, cavities, and pegmatites, commonly during igneous or metamorphic activity. Individual crystals may form over millions of years; age depends on its host deposit.

Uses & applications

Used for glass, engineered stone, ceramics, electronics, abrasives, and ornamental specimens. Attractive clusters are collected but this rough piece has modest commercial value.

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 it by its hardness, glassy luster, lack of cleavage, and inability to scratch it with a steel knife; it should scratch ordinary glass. Common worldwide, especially in Brazil, Madagascar, the United States, and alpine veins.