sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
Hardness: 6-7 (Mohs scale), Color: light grey to tan, Luster: dull/earthy, Structure: clastic/granular texture with visible layering, Cleavage: None (conchoidal to uneven fracture).
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Physical properties
Hardness: 6-7 (Mohs scale), Color: light grey to tan, Luster: dull/earthy, Structure: clastic/granular texture with visible layering, Cleavage: None (conchoidal to uneven fracture).
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually in riverbeds, deltas, or oceans. This specific specimen appears to be from a fluvial or riparian environment where water transport has rounded the edges over time.
Uses & applications
Commonly used as a building material, in asphalt and concrete production, and as a reservoir rock for oil and gas. In the field, it is often used for bank stabilization (riprap).
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Some sandstones are very resistant to weathering, making them excellent materials for ancient monuments and temples.
Field identification & locations
Identify by its gritty, sandpaper-like feel. It is found in any region with a history of sedimentary deposition. Collectors look for unique banding (Liesegang rings) or fossils within the matrix.
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