mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent milky-white to pale tan with vitreous-to-waxy luster. It has a hexagonal crystal structure, no cleavage, and conchoidal fracture; the yellow-brown areas are likely iron-oxide staining or surface alteration.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and pegmatites, commonly associated with igneous and metamorphic rocks. Quartz is geologically widespread and can form across much of Earth’s history, rather than having one specific age.

Uses & applications

Used in glass, ceramics, electronics, abrasives, countertops, and construction aggregate; attractive translucent pieces are used decoratively and occasionally as cabochons. This rough specimen has modest commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Its lack of cleavage and conchoidal fracture help distinguish it from feldspar and calcite.

Field identification & locations

Identify by its glassy appearance, hardness (scratches ordinary glass), lack of cleavage, and curved fracture surfaces; it commonly occurs worldwide in hydrothermal veins and granitic terrains. The pictured piece appears naturally fractured and iron-stained.