mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White/opaque milky white, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White/opaque milky white, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65
Formation & geological history
Formed in hydrothermal veins or pegmatites as liquid solutions cool. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative gravel or landscaping stones.
Geological facts
Milky Quartz is the most common variety of crystalline quartz. It is often found in massive form rather than distinct crystal points.
Field identification & locations
Identify in the field by its hardness (it can scratch glass) and lack of cleavage (it breaks with a conchoidal fracture). It is found worldwide in various terrains.
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