mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 (Mohs scale), Color: White to Milky, Luster: Vitreous/Waxy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to Milky, Luster: Vitreous/Waxy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed from cooling silica-rich magma or precipitation in hydrothermal veins. This specific specimen has been chemically and physically weathered and rounded by water action in a river or coastal environment.
Uses & applications
Commonly used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative river stone in landscaping.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear, but the milky white color seen here is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and mountain trails worldwide.
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Nephrite Jade
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral