metamorphic
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
Hardness: 7 (Mohs scale); Color: Yellow-orange to Tan; Luster: Vitreous to waxy (when wet/polished); Structure: Granular/Microcrystalline; Cleavage: None; Specific Gravity: 2.63 - 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Yellow-orange to Tan
- Luster
- Vitreous to waxy (when wet/polished)
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Physical properties
Hardness: 7 (Mohs scale); Color: Yellow-orange to Tan; Luster: Vitreous to waxy (when wet/polished); Structure: Granular/Microcrystalline; Cleavage: None; Specific Gravity: 2.63 - 2.65
Formation & geological history
Formed from the metamorphism of quartz sandstone under intense heat and pressure. This specific specimen has been further shaped by fluvial erosion (river action), giving it a smooth, rounded surface.
Uses & applications
Commonly used in landscaping, decorative gravel, as an abrasive, and by stone collectors/hinterlanders for rock tumbling.
Geological facts
Quartzite is so tough that it often survives intense mechanical weathering and chemical erosion long after the rocks surrounding it have disintegrated. Yellow coloring is usually due to iron oxide staining within the grain boundaries.
Field identification & locations
Identify in the field by its inability to be scratched by steel, its smooth texture compared to sandstone, and its lack of visible grains. Found in riverbeds and mountainous regions globablly.
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