mineral
Quartz Pebble (Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite inclusion
Hardness: 7 on Mohs scale. Color: Translucent white-to-yellowish with orange-brown iron staining in fractures. Luster: Vitreous to greasy. Fracture: Conchoidal. Specific gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale. Color: Translucent white-to-yellowish with orange-brown iron staining in fractures. Luster: Vitreous to greasy. Fracture: Conchoidal. Specific gravity: ~2.65.
Formation & geological history
Formed through hydrothermal crystallization in igneous or metamorphic veins. This rounded river pebble experienced alluvial weathering, water erosion, and secondary iron oxide staining within internal micro-fractures.
Uses & applications
Used primarily in lapidary work, decorative landscaping, aggregate, and as a common specimen for rock collectors.
Geological facts
Iron oxide (limonite or hematite) seeped into tiny fractures within the quartz crystal structure, giving it a bright golden-amber or rusty-orange core.
Field identification & locations
Identified by its ability to scratch glass, lack of cleavage, translucent appearance, and characteristic conchoidal fracture. Commonly found in riverbeds, gravel pits, and beaches worldwide.
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