sedimentary
Sandstone (Weathered Pebble)
Arenite (SiO2 primarily)
Hardness: 6-7 (if quartz-rich); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (if quartz-rich)
- Color
- Tan, beige, or light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (if quartz-rich); Color: Tan, beige, or light brown; 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 (clasts) the size of sand. This specific specimen appears to be a stream-tumbled or weathered pebble, likely rounded by water erosion.
Uses & applications
Commonly used as a construction material (dimension stone), in glass manufacturing (if high silica), or as a source of industrial sand.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. It often contains fossils and is a major reservoir for groundwater and petroleum due to its porosity.
Field identification & locations
Identify in the field by its 'sandpaper' texture and visible layering (bedding). It is found in basins, riverbeds, and deserts worldwide.
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