mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, vitreous-to-waxy luster, massive rather than visibly crystalline; Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The rounded surface appears naturally weathered or tumbled.
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Physical properties
White to translucent, vitreous-to-waxy luster, massive rather than visibly crystalline; Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The rounded surface appears naturally weathered or tumbled.
Formation & geological history
Forms when silica-rich fluids crystallize in veins, cavities, and pegmatites, or when quartz grains recrystallize in metamorphic rocks. Quartz is common from Precambrian to present-day geological environments.
Uses & applications
Used for glass, ceramics, engineered stone, abrasives, and electronics; attractive translucent pieces are collected or used ornamentally. This specimen is not gem-quality based on its opaque, irregular appearance.
Geological facts
Milky color results from microscopic fluid inclusions, fractures, or defects scattering light. Quartz is one of Earth’s most abundant and durable minerals.
Field identification & locations
Identify by hardness, lack of cleavage, conchoidal fracture, and inability to scratch it with a steel knife; it should scratch ordinary glass. Common worldwide in quartz veins, pegmatites, and granite-related deposits.
