mineral/igneous/metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs), Color: White to cream/translucent, Luster: Vitreous to greasy, Crystal System: Hexagonal/Trigonal, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs), Color: White to cream/translucent, Luster: Vitreous to greasy, Crystal System: Hexagonal/Trigonal, Specific Gravity: 2.65
Formation & geological history
Forms through the cooling of silica-rich magma or precipitation from hydrothermal fluids in veins. This specimen is a water-worn river pebble, indicating significant transport and erosion over geologic time.
Uses & applications
Used in glass making, electronics (piezoelectric properties), abrasives, and as decorative aggregate in landscaping or aquarium decor.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its characteristic white color from tiny fluid inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify by its hardness (it will scratch glass), lack of cleavage, and conchoidal fracture. Commonly found in river beds, beaches, and mountainous regions worldwide.
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