sedimentary
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
Hardness: 6-7 (Mohs scale); Color: Grey, brownish-grey, or tan; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None (grains are cemented together); Specific gravity: 2.6-2.7.
- Hardness
- 6-7 (Mohs scale)
- Color
- Grey, brownish-grey, or tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Grey, brownish-grey, or tan; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None (grains are cemented together); Specific gravity: 2.6-2.7.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposits in marine, river, or desert environments. This specimen appears to be weathered surface rock from the Phanerozoic eon.
Uses & applications
Primary use in construction (crushed stone, road base), building material for pavers or walls, and occasionally as a reservoir rock for oil and gas.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks in the Earth's crust. It is a key indicator for geologists in determining ancient environmental conditions like flow direction of prehistoric rivers.
Field identification & locations
Identify in the field by its 'gritty' feel, similar to sandpaper, and a lacks of visible bedding planes in the massive variety. Commonly found in outcroppings, river beds, and mountainous regions worldwide.
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