metamorphic
Green Quartzite / Quartz Pebble
SiO2 (Silicon Dioxide with inclusions)
Hardness: 7 on the Mohs scale. Color: Pale green to olive grey. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal to uneven fracture). Specific gravity: ~2.65.
- Hardness
- 7 on the Mohs scale
- Color
- Pale green to olive grey
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 7 on the Mohs scale. Color: Pale green to olive grey. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal to uneven fracture). Specific gravity: ~2.65.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. Heat and pressure recrystallize quartz grains into a dense interlocked network, with green coloration typically coming from trace inclusions of fuchsite (chromium mica), epidote, or chlorite.
Uses & applications
Commonly used as decorative river rock, landscaping pebble, tumbling material, or for lapidary carving and polishing.
Geological facts
Quartzite pebbles are extremely durable and highly resistant to chemical and physical weathering, allowing them to travel long distances in river beds and remain intact for millions of years.
Field identification & locations
Identify by checking hardness (scratches glass easily at 7) and observing the granular, sugary or waxy texture. Commonly found in river beds, beaches, and glacial till deposits worldwide.
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