mineral
Iron-stained Quartz Pebble
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
Mohs hardness of 7, vitreous to greasy luster, trigonal crystal system (microcrystalline or massive in pebbles), conchoidal fracture, reddish-orange to yellowish-brown coloration due to iron oxide staining.
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Physical properties
Mohs hardness of 7, vitreous to greasy luster, trigonal crystal system (microcrystalline or massive in pebbles), conchoidal fracture, reddish-orange to yellowish-brown coloration due to iron oxide staining.
Formation & geological history
Formed in hydrothermal veins or igneous rocks, later weathered, eroded, and rounded by fluvial or coastal water action. Stained by secondary iron oxide minerals over time.
Uses & applications
Commonly used for landscaping, decorative stone collections, tumbling, and educational purposes.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust. The reddish or brownish-orange color comes from microscopic iron oxide deposits trapped inside fractures or coating the outer surface.
Field identification & locations
Identified by its high hardness (scratches glass easily), waxy to glass-like luster when wet or polished, and smooth rounded pebble morphology. Found in stream beds, beaches, and gravel deposits worldwide.
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