metamorphic
Quartzite Pebble (Stream-rounded Quartz/Quartzite Gravel)
Quartzite / Silicon Dioxide (SiO2)
Hardness 7 on the Mohs scale, yellowish-cream or off-white color, waxy to dull smooth luster, massive/microcrystalline structure, no cleavage, specific gravity ~2.65.
Identified More metamorphic →
Explore Quartzite Pebble (Stream-rounded Quartz/Quartzite Gravel) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness 7 on the Mohs scale, yellowish-cream or off-white color, waxy to dull smooth luster, massive/microcrystalline structure, no cleavage, specific gravity ~2.65.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure during regional metamorphism. The rounded pebble shape is created by natural erosion in rivers, streams, or coastal beach environments.
Uses & applications
Commonly used in decorative landscaping, rock tumbling, educational rock collections, aquarium gravel, and road aggregate.
Geological facts
Stream-smoothed pebbles like this are natural examples of abrasion, where water transport grinds away rough edges over thousands of years.
Field identification & locations
Identified by its smooth oval shape, hardness (cannot be scratched by a steel knife), and yellowish-tan translucent to opaque quartz composition. Extremely common along riverbeds, lakeshores, and glacial deposits globally.
More like this
