sedimentary
Pebble (likely Limestone or Siltstone)
Lithic fragment (calcareous or siliciclastic)
Hardness: 3-5 (Mohs scale), Color: tan to light brown, Luster: dull/earthy, Crystal structure: microcrystalline, Cleavage: none, Texture: smooth and water-worn (rounded)
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Physical properties
Hardness: 3-5 (Mohs scale), Color: tan to light brown, Luster: dull/earthy, Crystal structure: microcrystalline, Cleavage: none, Texture: smooth and water-worn (rounded)
Formation & geological history
Formed by the accumulation of sediment in marine or riverine environments. Its rounded shape is the result of mechanical weathering and abrasion, likely in a riverbed or coastal area over thousands of years.
Uses & applications
Commonly used in landscaping, as aggregate in construction, or kept as 'found objects' or 'pocket stones' for their tactile quality.
Geological facts
Small rounded rocks like this are often called 'river stones.' The slit visible on the surface is likely a natural fracture or a 'chatter mark' caused by the stone striking other rocks during transport in water.
Field identification & locations
Field identification is based on the smooth, rounded shape and fine-grained texture. To distinguish limestone from siltstone, one would use a drop of dilute hydrochloric acid; limestone will fizz.
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