mineral
Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 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
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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.
