sedimentary
Granular Sandstone
Arenite (variable composition, primarily SiO2)
Hardness: 6-7 (on Mohs scale); Color: Grayish-tan/buff; Luster: Dull/Earthy; Crystal structure: Clastic (usually quartz grains); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (on Mohs scale)
- Color
- Grayish-tan/buff
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Grayish-tan/buff; Luster: Dull/Earthy; Crystal structure: Clastic (usually quartz grains); Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral particles or rock fragments. This occurs in various environments such as deserts, river beds, or beaches over millions of years.
Uses & applications
Commonly used in construction for concrete aggregate, road base, and decorative stone. Sometimes used in glass manufacturing if silica content is exceptionally high.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth and is a primary reservoir rock for groundwater and petroleum because of its porosity.
Field identification & locations
Identify by its 'sandpaper' feel and visible small grains. Found globally in basins and cliff faces. Collectors look for unique banding (Liesegang rings) or fossil inclusions.
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