mineral
Quartz Pebble (Yellow/Iron-Stained Quartz)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Yellowish-brown, tan, or orange-brown due to iron oxide impurities; Luster: Vitreous to waxy/sub-vitreous; Crystal Structure: Trigonal (microcrystalline or massive quartz aggregate); Cleavage: None, fractures conchoidally; Specific Gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to waxy/sub-vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Yellowish-brown, tan, or orange-brown due to iron oxide impurities; Luster: Vitreous to waxy/sub-vitreous; Crystal Structure: Trigonal (microcrystalline or massive quartz aggregate); Cleavage: None, fractures conchoidally; Specific Gravity: ~2.65.
Formation & geological history
Formed through silica precipitation in hydrothermal veins or sedimentary deposits, subsequently weathered, eroded, and rounded into a smooth pebble by stream, river, or beach action.
Uses & applications
Commonly collected as river rocks or landscaping stone; smaller rounded quartz pebbles are used in tumbling, lapidary projects, and ornamental gravel.
Geological facts
Yellow to brown staining on microcrystalline quartz and quartzite is caused by limonite or hematite coatings that seep into microscopic pores and fractures over long periods of weathering.
Field identification & locations
Can be identified by its smooth, water-worn texture, hardness of 7 (will scratch glass and steel), and lack of cleavage. Found abundantly in riverbeds, gravel pits, and beaches worldwide.
