sedimentary
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 Mohs (grains), Color: Tan, yellowish-brown, Luster: Dull/Earthy, Crystal structure: Granular/Clastic, Cleavage: None, Specific gravity: 2.0-2.6
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Physical properties
Hardness: 6-7 Mohs (grains), Color: Tan, yellowish-brown, Luster: Dull/Earthy, Crystal structure: Granular/Clastic, Cleavage: None, Specific gravity: 2.0-2.6
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears to have been weathered in a fluvial or terrestrial environment, potentially containing organic impressions.
Uses & applications
Commonly used as a building material, in paving, for making grindstones, or as a decorative garden stone. These rough field specimens have primarily educational or landscaping value.
Geological facts
Sandstone accounts for about 20-25% of all sedimentary rocks in the earth's crust. It is a major reservoir for groundwater and petroleum products due to its porosity.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grain layers. Often found in riverbeds, cliffs, and desert environments. Check for reaction with HCl; if it fizzes, it contains calcium carbonate cement.
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