metamorphic
Yellow Quartzite (River Pebble)
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Yellowish-tan to golden brown due to iron inclusions; Luster: Vitreous to dull; Crystal structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Yellowish-tan to golden brown due to iron inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Yellowish-tan to golden brown due to iron inclusions; Luster: Vitreous to dull; Crystal structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, recrystallizing individual grains into a fused mass. This specific specimen has been further shaped and polished by fluvial (river) erosion.
Uses & applications
Commonly used as decorative landscaping stone, in construction aggregates, or as tumbled 'worry stones' and pocket charms.
Geological facts
Quartzite is so hard that it can scratch glass and even steel. It is more resistant to weathering than the original sandstone it formed from, which is why it often survives as smooth river pebbles.
Field identification & locations
Identify in the field by its hardness (will scratch a glass bottle) and its 'sugary' texture on a fresh break. Commonly found in riverbeds, glacial deposits, and mountain ranges.
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