mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, milky white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, milky white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed in hydrothermal veins, pegmatites, and igneous, metamorphic, and sedimentary rocks globally through the cooling and precipitation of silicon-rich fluids over geological timescales.
Uses & applications
Used in ornamental stone, gemstone carvings, glassmaking, abrasive materials, and occasionally as a source of high-purity silicon for electronics.
Geological facts
Milky quartz is the most common variety of the quartz family. The cloudy white appearance is caused by microscopic fluid inclusions trapped within the crystal during its formation.
Field identification & locations
Easily identified by its high hardness (scratches glass), white milky appearance, and lack of cleavage. Found worldwide in almost all geological environments.
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Septarian Pebble
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Schist
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Metamorphic
Potassium Feldspar (Orthoclase)
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