sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
Hardness: 6-7 (on Mohs scale for quartz grains); Color: Tan, brown, reddish-brown; Luster: Dull or earthy; Crystal structure: Granular/Clastic texture; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (on Mohs scale for quartz grains)
- Color
- Tan, brown, reddish-brown
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 (on Mohs scale for quartz grains); Color: Tan, brown, reddish-brown; Luster: Dull or earthy; Crystal structure: Granular/Clastic texture; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments. Geologically, it forms in environments like deserts, river deltas, or beaches. Age can range from modern day to billions of years old.
Uses & applications
Widely used as a building material in construction, flagstones for paving, grindstones for sharpening tools, and as a reservoir rock for petroleum and natural gas exploration.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks in the Earth's crust. Famously, buildings like the White House and the ruins of Petra are made primarily of sandstone.
Field identification & locations
Identify by its 'sandpaper' feel and visible grains. Often found in layered beds or outcrops near ancient riverbeds or coastal areas. Collectors look for unique banding patterns known as Liesegang rings.
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