sedimentary
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (Mohs scale), Color: Brownish-grey to tan, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Brownish-grey to tan, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments of sand size (0.0625 to 2 mm). Often deposited in riverbeds, deltas, or coastal environments. This specimen appears to contain organic carbonaceous material (plant remains).
Uses & applications
Construction material, glass making (if high silica), grindstones, and architectural decorative stone. In geology, it is an important reservoir rock for groundwater and petroleum.
Geological facts
Sandstone is one of the most common types of sedimentary rock and accounts for about 10-20% of all sedimentary rocks on Earth. The dark streaks in this sample likely represent ancient leaf or stem impressions.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Common in sedimentary basins worldwide. Look for bedding planes and fossil inclusions.
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