mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent with a vitreous-to-waxy luster, irregular fracture, and no cleavage. It has a hexagonal crystal structure, though this specimen is massive and poorly crystallized; yellow-orange areas may be iron staining or attached matrix.

Identified September 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and pegmatites, commonly during igneous or metamorphic activity. Quartz is geologically widespread and ranges from Precambrian to modern formations.

Uses & applications

Used for glass, ceramics, abrasives, electronics, and engineered stone; attractive translucent pieces are sold as inexpensive décor or lapidary material.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. The specimen’s cloudy appearance results from microscopic fluid inclusions, fractures, or fine mineral impurities.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it should not be confused with calcite, which is much softer. Common worldwide, especially in hydrothermal veins and granitic terrains.