mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Mohs hardness of 7, white to translucent color, vitreous (glassy) luster, hexagonal crystal system, conchoidal fracture (no cleavage), specific gravity of 2.65

Identified June 2, 2026More mineral →

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Physical properties

Mohs hardness of 7, white to translucent color, vitreous (glassy) luster, hexagonal crystal system, conchoidal fracture (no cleavage), specific gravity of 2.65

Formation & geological history

Formed by the crystallization of silica-rich hydrothermal fluids in veins or from cooling magma in igneous rocks; common in metamorphic environments. Its age can range from billions of years to relatively young formations.

Uses & applications

Used in glass making, abrasive manufacturing, electronics (due to piezoelectric properties), construction aggregates, and as tumbled stones for decoration or jewelry.

Geological facts

The milky appearance is caused by tiny liquid or gas inclusions trapped during the crystal's formation. It is one of the most common minerals on Earth's crust.

Field identification & locations

Identified in the field by its hardness (scratches glass), waxy to vitreous luster, and lack of cleavage. Found globally in riverbeds, beaches, and mountain ranges.