mineral

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Yellowish-brown to tan due to limonite/iron oxide staining, with a microcrystalline quartz base. Luster: Waxy to dull pebble surface. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.

Hardness: 7 on Mohs scale
Luster: Waxy to dull pebble surface

Identified July 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich fluid deposition in veins, which subsequently eroded into stream or river channels. Water action smoothed and rounded the pebble over time, while surrounding iron-rich minerals caused surface staining.

Uses & applications

Commonly collected as river rocks, used in landscaping, riverbed decorations, or for tumbling in rock lapidary hobbies.

Geological facts

Quartz is one of the most abundant minerals in the Earth's crust. Water-worn pebbles often feature intricate fractures or veining where iron oxides seep into micro-fissures, creating a marbled pattern.

Field identification & locations

Identified by its high hardness (scratches glass readily) and rounded river-worn morphology. Extremely common in riverbeds, streams, beaches, and glacial gravel deposits worldwide.