sedimentary
Coarse Sandstone Pebble
Clastic Sedimentary Rock (Sandstone)
Hardness: 6-7 Mohs (if quartz-rich); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs (if quartz-rich)
- Color
- Tan, beige, or light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs (if quartz-rich); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in river beds, beaches, or deserts.
Uses & applications
Used primarily as aggregate in construction, road base, and occasionally as decorative stone in landscaping or as a tumbling medium for beginner rock collectors.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth and is often a major reservoir for water (aquifers) and oil due to its high porosity.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in dry creek beds or areas with exposed sedimentary layers.
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