mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and a hexagonal crystal structure. The specimen appears massive and somewhat weathered, with possible iron-oxide staining or minor attached matrix.

Identified September 12, 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; quartz is extremely widespread and ranges from Precambrian to modern formation. The irregular surface may reflect natural fracture or partial dissolution.

Uses & applications

Used industrially for glass, ceramics, abrasives, silicon production, and engineered stone; attractive pieces are sold as inexpensive mineral specimens or lapidary material.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Milky color results mainly from microscopic fluid inclusions and defects.

Field identification & locations

Identify by its hardness, glassy fracture, lack of cleavage, and inability to be scratched by a steel knife; it should scratch ordinary glass. Common in quartz veins worldwide, especially Brazil, Madagascar, the United States, and the Alps.