mineral

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Yellowish-brown to tan (due to iron oxide coating/inclusion). Luster: Vitreous to greasy. Crystal System: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture).

Hardness: 7 on Mohs scale
Color: Yellowish-brown to tan (due to iron oxide coating/inclusion)
Luster: Vitreous to greasy

Identified July 27, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: Yellowish-brown to tan (due to iron oxide coating/inclusion). Luster: Vitreous to greasy. Crystal System: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture).

Formation & geological history

Formed in hydrothermal veins and igneous/metamorphic rocks, then weathered and rounded by stream or wave action. Iron oxide minerals like hematite or goethite give it the yellowish-brown coloration.

Uses & applications

Commonly collected as a beach or river pebble, used in lapidary work, landscaping aggregate, and as a mineral specimen.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear, but iron oxide stains create a wide range of yellow, orange, and brown hues on eroded pebbles.

Field identification & locations

Can be identified in the field by its hardness (scratches glass and steel), lack of cleavage, and translucent waxy appearance under bright light. Found in riverbeds, beaches, and gravel pits worldwide.