sedimentary
Sandstone
Arenite (SiO2 based)
Hardness: 6-7 Mohs; Color: Tan, buff, or cream; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, buff, or cream
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, buff, or cream; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized minerals (mostly quartz) or rock grains. These deposits often occur in deserts, river beds, or beaches. Geological age can range from Precambrian to Holocene.
Uses & applications
Widely used as a construction material (dimension stone), in the manufacture of glass, as an abrasive agent, and for artistic sculptures.
Geological facts
Sandstone is one of the most common types of sedimentary rock and is often a major reservoir for water (aquifers) and oil/gas due to its porosity.
Field identification & locations
Identify in the field by its 'sandpaper' texture and visible grains. Often found in outcropping cliffs or canyon walls. Collectors look for unique banding or fossil inclusions.
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