sedimentary
Sandstone (with potential Quartzite characteristics)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 Mohs; Color: Tan, yellowish-brown to grey; Luster: Dull to earthy; Crystal structure: Granular (clastic texture); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, yellowish-brown to grey
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, yellowish-brown to grey; Luster: Dull to earthy; Crystal structure: Granular (clastic texture); 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 (lithification). These grains are typically weathered from older rocks and deposited by water or wind. This specific specimen shows signs of water erosion.
Uses & applications
Used widely in construction as a building material, in the glass industry as a source of silica, and as a reservoir rock in the petroleum industry. It is also used as decorative paving stones.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. It serves as one of the most important aquifers for groundwater and reservoirs for natural gas and oil.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layering (bedding). This specimen has a distinct conchoidal-to-irregular fracture and a weathered 'rind' or skin on the top edge.
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