sedimentary
Sandstone (likely Calcareous or Micaceous)
Clastic sedimentary rock (primarily Quartz with Cementing Agents)
Hardness: 6-7 on Mohs scale (for grains), 2-3 (for cement); Color: Tan, beige, light brown; Luster: Dull/Earthy; Crystal Structure: Clastic (granular texture); Cleavage: None; Specific Gravity: 2.0-2.6
- Hardness
- 6-7 on Mohs scale (for grains), 2-3 (for cement)
- Color
- Tan, beige, light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale (for grains), 2-3 (for cement); Color: Tan, beige, light brown; Luster: Dull/Earthy; Crystal Structure: Clastic (granular texture); Cleavage: None; Specific Gravity: 2.0-2.6
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral grains or rock fragments, typically through the process of compaction and cementation in marine, river, or desert environments.
Uses & applications
Commonly used in construction as building stone, flagstone, and as a source for silica in glass manufacturing. Also used for decorative purposes.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The famous Red Rocks in Colorado and the Treasury at Petra in Jordan are carved from or comprised of sandstone.
Field identification & locations
Identify by its 'sandpaper' feel and visible grains. In the field, look for bedding planes or layers. It is ubiquitous in sedimentary basins worldwide.
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