mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, hexagonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65. The rounded appearance may indicate natural weathering or tumbling.
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Physical properties
Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, hexagonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65. The rounded appearance may indicate natural weathering or tumbling.
Formation & geological history
Forms when silica-rich fluids crystallize in fractures, veins, pegmatites, or cavities, commonly in granitic and metamorphic terrains. Individual specimens can range from ancient Precambrian rocks to geologically recent vein material.
Uses & applications
Used as an industrial silica source, glass and ceramic ingredient, abrasive, and ornamental stone; attractive crystals are collected but generally have modest gem value.
Geological facts
Its cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities rather than a different quartz species.
Field identification & locations
Identify by its hardness, glassy appearance, lack of cleavage, and conchoidal break; it can scratch ordinary glass but should not be confused with white calcite, which is much softer and reacts with acid. Common worldwide, especially in quartz veins and pegmatites.
