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, and a specific gravity of around 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, and a specific gravity of around 2.65.
Formation & geological history
Forms in hydrothermal veins, pegmatites, and igneous, metamorphic, and sedimentary rocks as silica-rich solutions cool and precipitate.
Uses & applications
Used in gemstone and ornamental carvings, glassmaking, abrasives, and as mineral collector specimens.
Geological facts
Milky quartz is the most common variety of crystalline quartz found on Earth. Its milky appearance is caused by microscopic liquid or gas-filled inclusions trapped during crystal growth.
Field identification & locations
Identified by its white color, lack of cleavage, conchoidal fracture, and high hardness capable of scratching glass. Found worldwide in nearly every geological environment.
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