metamorphic
Quartzite Pebble
Quartzite (SiO2) with iron staining
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: White to gray with orange/brown iron oxide staining, Luster: Vitreous to dull, Crystal structure: Granular, interlocking quartz grains, Cleavage: None (conchoidal fracture), Specific gravity: ~2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to gray with orange/brown iron oxide staining, Luster: Vitreous to dull, Crystal structure: Granular, interlocking quartz grains, Cleavage: None (conchoidal fracture), Specific gravity: ~2.65
Formation & geological history
Metamorphism of quartz sandstone, subsequently weathered, transported by water, and rounded into a pebble over time.
Uses & applications
Commonly collected by rockhounds, often polished in rock tumblers for decorative use. Larger deposits are used for construction, decorative stone, and manufacturing glass.
Geological facts
The orange-brown coloration is due to iron oxide (rust) that has infiltrated the micro-fractures and grain boundaries of the rock.
Field identification & locations
Identified by its hardness (will scratch glass), granular texture (though often smoothed by water), and lack of cleavage. Very common in riverbeds, beaches, and glacial deposits.
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