sedimentary
Sandstone (likely Arkosic)
Arenite (SiO2 with KAlSi3O8)
Hardness: 6-7 (individual grains); Color: Tan, brown, and grey; Luster: Dull/Earthy; Crystal structure: Clastic (fragmental); Cleavage: None (fractures around grains)
- Hardness
- 6-7 (individual grains)
- Color
- Tan, brown, and grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (individual grains); Color: Tan, brown, and grey; Luster: Dull/Earthy; Crystal structure: Clastic (fragmental); Cleavage: None (fractures around grains)
Formation & geological history
Formed from the weathering of granitic rocks followed by the accumulation and cementation of mineral particles (sand size). Typically formed in terrestrial or near-shore environments over millions of years.
Uses & applications
Used primarily in construction as a building material, crushed stone for road bases, and historically for grindstones or architectural carvings.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. It is a vital reservoir rock for groundwater, oil, and natural gas due to its porosity.
Field identification & locations
Identify in the field by its 'sandpaper' feel and visible grains. Often found in layered outcrops or desert environments. This specific specimen shows visible feldspar and quartz grains.
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