mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, glassy-to-waxy luster with irregular granular crystal masses; Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The creamy coloration commonly results from microscopic fluid inclusions or fractures.

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids crystallize in veins, cavities, and pegmatites, or during metamorphic recrystallization. Quartz is common from Precambrian to modern geological settings; the exact age cannot be determined visually.

Uses & applications

Used for glass, ceramics, engineered stone, abrasives, and electronics; attractive pieces are sold as inexpensive mineral specimens. This rough, ordinary-quality example has limited gem value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of many quartz veins. It may resemble calcite, but quartz is harder and does not fizz with dilute hydrochloric acid.

Field identification & locations

Common worldwide, especially in quartz veins, granite pegmatites, and metamorphic rocks. Test a concealed edge against glass: quartz should scratch it; avoid confusing surface scratches or coatings with true hardness.