metamorphic
Quartzite pebble
Quartzite (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale. Yellowish to brownish color, grainy texture, waxy to dull luster. No cleavage, conchoidal fracture.
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Physical properties
Hardness 7 on Mohs scale. Yellowish to brownish color, grainy texture, waxy to dull luster. No cleavage, conchoidal fracture.
Formation & geological history
Formed from quartz-rich sandstone subjected to heat and pressure, then weathered and rounded by water transport (river or beach environment).
Uses & applications
Commonly used in construction, road ballast, landscaping, and sometimes tumbled for decorative purposes.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming ridges and hilltops in landscapes.
Field identification & locations
Identify by its hardness (scratches glass), grainy but fused texture, and lack of reaction to acid. Often found in riverbeds or beaches where softer rocks have eroded away.
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