metamorphic
River Stone (Green Quartzite)
Quartzite (Metamorphosed Sandstone)
Hardness: 7 on the Mohs scale. Color: Olive to dark green. Luster: Vitreous to greasy. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None (fractures conchoidally). Specific gravity: 2.65.
- Hardness
- 7 on the Mohs scale
- Color
- Olive to dark green
- Luster
- Vitreous to greasy
Identified More metamorphic →
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Physical properties
Hardness: 7 on the Mohs scale. Color: Olive to dark green. Luster: Vitreous to greasy. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None (fractures conchoidally). Specific gravity: 2.65.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and tectonic pressure during regional metamorphism, subsequently weathered and water-worn into an oval pebble shape in a river environment.
Uses & applications
Used in landscaping, decorative home displays, meditation, and stone-stacking.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-rich river stones retain their smooth, rounded shapes for long periods.
Field identification & locations
Can be identified in the field by its hardness (scratches glass easily), lack of effervescence with acid, and smooth, water-worn texture. Found globally in riverbeds and ancient sedimentary deposits.
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