sedimentary
Sandstone pebble
Sandstone (mainly Quartz, SiO2)
Hardness 6-7 (Mohs scale), dull to earthy luster, fine to medium-grained sand-like texture, light tan to grey color with a darker mineral inclusion or matrix patch.
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Physical properties
Hardness 6-7 (Mohs scale), dull to earthy luster, fine to medium-grained sand-like texture, light tan to grey color with a darker mineral inclusion or matrix patch.
Formation & geological history
Formed by the compaction and cementation of sand-sized mineral particles or rock fragments, typically in riverbeds, lakes, or marine environments. Later rounded by water erosion into a river pebble.
Uses & applications
Commonly used in construction aggregate, landscaping, road base, and general rock collecting.
Geological facts
Sandstone is one of the most common types of sedimentary rock found on Earth, representing about 10 to 20 percent of all sedimentary rocks.
Field identification & locations
Identified by its grainy, sandpaper-like surface feel and visible quartz sand grains. Commonly found along riverbeds, beaches, and eroded rock formations worldwide.
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