mineral
Quartz Pebble (Iron-Stained Quartz)
Silicon Dioxide (SiO2)
Mohs hardness of 7, yellowish-tan to orange-brown color due to iron oxide staining, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Mohs hardness of 7, yellowish-tan to orange-brown color due to iron oxide staining, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed in igneous or metamorphic veins and pegmatites, then eroded, weathered, and rounded by water transport in rivers, streams, or coastal beach environments.
Uses & applications
Used in landscaping gravel, water filtration, construction aggregate, and as tumbled decorative stones or pocket stones.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. The yellowish-orange surface tint is caused by limonite or hematite micro-coatings absorbed during weathering.
Field identification & locations
Identified by its hard surface (scratches glass), waxy to glass-like luster, translucent appearance, and water-worn rounded shape. Found globally in stream beds, river gravels, and beaches.
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