mineral
Milky quartz
Quartz (silicon dioxide, SiO₂), likely a massive vein-quartz specimen
AI-generated identification · may be incorrectTypically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65. The specimen appears massive, weathered, and iron-stained rather than distinctly crystalline.
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Physical properties
Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65. The specimen appears massive, weathered, and iron-stained rather than distinctly crystalline.
Formation & geological history
Forms when silica-rich hydrothermal fluids fill fractures and cool, commonly in igneous, metamorphic, and sedimentary host rocks. Individual veins may range from Precambrian to recent geological ages; age cannot be determined from the image.
Uses & applications
Used for glass, ceramics, engineered stone, abrasives, and silicon production; attractive pieces are collected or used decoratively, though this sample appears common and non-gem quality.
Geological facts
Milky color results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and chemically resistant minerals.
Field identification & locations
Identify by its hardness, lack of cleavage, glassy fracture, and inability to scratch it with a steel knife; it should scratch ordinary glass. Common worldwide in quartz veins, granite pegmatites, and metamorphic terrains.
