metamorphic
Quartzite Pebble
SiO2 (Silicon Dioxide)
Hardness: 7 on Mohs scale; Color: off-white to yellowish-brown; Luster: dull to vitreous; Structure: granular/crystalline; Cleavage: poor/conchoidal fracture
- Hardness
- 7 on Mohs scale
- Color
- off-white to yellowish-brown
- Luster
- dull to vitreous
Identified More metamorphic →
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Physical properties
Hardness: 7 on Mohs scale; Color: off-white to yellowish-brown; Luster: dull to vitreous; Structure: granular/crystalline; Cleavage: poor/conchoidal fracture
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. This specific piece shows significant rounding from water erosion (alluvial/river process).
Uses & applications
Commonly used as construction aggregate, in decorative landscaping, or as a crushing medium in industrial ball mills.
Geological facts
Quartzite is one of the most durable and weather-resistant rocks on Earth. Because of its hardness, it often survives long-distance transport in rivers and remains as pebbles when softer rocks have eroded away.
Field identification & locations
Identified by its sugary texture and extreme hardness (it will easily scratch glass). Common in riverbeds, glacial deposits, and mountain ranges.
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