mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Milky white to light greenish-grey. Luster: Vitreous to greasy. Crystal structure: Trigonal/Hexagonal. Fracture: Conchoidal. Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Milky white to light greenish-grey
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale. Color: Milky white to light greenish-grey. Luster: Vitreous to greasy. Crystal structure: Trigonal/Hexagonal. Fracture: Conchoidal. Specific gravity: 2.65.
Formation & geological history
Formed in hydrothermal veins, pegmatites, or metamorphic rocks. Smoothness is the result of natural erosion and polishing by water action along a beach or riverbed.
Uses & applications
Used in landscaping, decorative stone collections, aquariums, glass making, and as a source of silicon.
Geological facts
Milky quartz gets its cloudy white color from microscopic fluid inclusions trapped inside the crystal during its growth millions of years ago.
Field identification & locations
Commonly found in beach gravels, riverbeds, and glacial deposits worldwide. Identified by its hardness (scratches glass), waxy to glass-like luster, and lack of cleavage.
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