sedimentary
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: light grey to tan, Luster: dull/earthy, Structure: granular with visible bedding/lamination, Cleavage: none, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: light grey to tan, Luster: dull/earthy, Structure: granular with visible bedding/lamination, Cleavage: none, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specific specimen shows visible lamination layers and has been smoothed by water erosion (fluvial or marine environment).
Uses & applications
Common sandstone is used extensively in construction as building stone, pavers, and as a source of silica for glass manufacturing.
Geological facts
The visible lines on the surface are 'laminae' or small-scale bedding layers that represent changes in sediment supply or current during deposition millions of years ago.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layering. It is common on beaches and in riverbeds globally. For collectors, look for unique erosion patterns or fossils.
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