sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Buff, light yellowish-brown, translucent white. Luster: Vitreous to waxy when water-worn. Structure: Trigonal/Microcrystalline. Specific Gravity: ~2.65.

Hardness: 7 on Mohs scale
Color: Buff, light yellowish-brown, translucent white
Luster: Vitreous to waxy when water-worn

Identified July 24, 2026More sedimentary →

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Physical properties

Hardness: 7 on Mohs scale. Color: Buff, light yellowish-brown, translucent white. Luster: Vitreous to waxy when water-worn. Structure: Trigonal/Microcrystalline. Specific Gravity: ~2.65.

Formation & geological history

Formed through the erosion and weathering of quartz-rich igneous or metamorphic rocks. Over time, water action in rivers, streams, or ocean coasts rounds and smoothes the fragment into a pebble.

Uses & applications

Commonly used in landscaping, river rock decor, aggregate for concrete, and basic rock tumbling projects.

Geological facts

Quartz is one of the most abundant minerals on Earth's surface and is highly resistant to chemical and physical weathering, which allows it to survive long transport distances in rivers.

Field identification & locations

Identified by its hard, scratch-resistant surface (can scratch glass), smooth rounded shape, and translucent quality when held to a light source. Very common in alluvial deposits worldwide.