mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness 7 on Mohs scale, vitreous to greasy luster, milky white color with reddish iron oxide staining, trigonal crystal system, conchoidal fracture, no true cleavage, specific gravity approximately 2.65.
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Physical properties
Hardness 7 on Mohs scale, vitreous to greasy luster, milky white color with reddish iron oxide staining, trigonal crystal system, conchoidal fracture, no true cleavage, specific gravity approximately 2.65.
Formation & geological history
Forms during hydrothermal activity, cooling of pegmatites, and within hydrothermal quartz veins. The milky appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth. Found globally across various geological ages.
Uses & applications
Used in glassmaking, ceramics, abrasive industries, electronics (piezoelectric applications), landscaping, and as a popular specimen for rock collecting and lapidary arts.
Geological facts
Milky quartz is one of the most common quartz varieties on Earth. The milky appearance is caused by millions of tiny fluid-filled cavities contained within the crystal lattice.
Field identification & locations
Identified by its harness (scratches glass, cannot be scratched by steel), characteristic white color, greasy to vitreous luster, and lack of cleavage. Commonly found in quartz veins, pegmatites, and gravel deposits.
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