sedimentary
Sandstone (Pebble)
Clastic sedimentary rock (SiO2 primary)
Hardness: 6-7 Mohs (if quartz-rich); Color: Tan, beige, light brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 Mohs (if quartz-rich)
- Color
- Tan, beige, light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs (if quartz-rich); Color: Tan, beige, 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 of sand size (0.0625 to 2 mm). This specific specimen shows signs of fluvial or coastal erosion, giving it a rounded, water-worn shape.
Uses & applications
Used widely in construction as a building material and paving stone; also used in the glass industry if high in silica. Small tumbled pieces are common for decorative landscaping and beginner rock collections.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. It often contains fossils and creates significant aquifers that hold groundwater or petroleum reservoirs.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grain layers. For collectors, look for 'picture sandstone' or specimens with fossil inclusions. Commonly found in riverbeds, deserts, and coastal areas.
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