sedimentary
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
Hardness: 3-7 depending on exact mineralogy, Color: Tan, buff, light brown, grey, Luster: Dull to earthy, Structure: Fine-grained to clastic, Cleavage: None
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Physical properties
Hardness: 3-7 depending on exact mineralogy, Color: Tan, buff, light brown, grey, Luster: Dull to earthy, Structure: Fine-grained to clastic, Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of mineral particles or organic remains in marine, river, or desert environments.
Uses & applications
Used primarily in construction, aggregate, landscaping, or as building material.
Geological facts
Sedimentary rocks compose the majority of Earth's land surface and often contain fossils, providing a rich record of Earth's past climate and life.
Field identification & locations
Look for rounded or weathered surface textures resting on exposed earth or bedrock paths. Widely distributed globally.
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