mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- Milky white to translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed from cooling magma or hydrothermal veins, subsequently weathered and water-worn into a smooth pebble shape over thousands of years. Common in riverbeds and beaches.
Uses & applications
Used in construction (as aggregate), glass making, electronics (semiconductors), and as decorative landscaping stones or pocket stones.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is known as rock crystal, while milky quartz gets its color from tiny fluid inclusions.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage. Look for smooth, rounded textures in fluvial or coastal environments. Found globally.
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Arenite (SiO2 based)
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
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Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
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