sedimentary
Sandstone
Arenite (SiO2 with various cementation agents)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or buff; Luster: Dull or earthy; Crystal structure: Clastic (composed of sand-sized mineral grains); Cleavage: None; Specific Gravity: 2.2 to 2.8.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, or buff
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or buff; Luster: Dull or earthy; Crystal structure: Clastic (composed of sand-sized mineral grains); Cleavage: None; Specific Gravity: 2.2 to 2.8.
Formation & geological history
Sandstone forms through the accumulation of sand-sized grains, typically quartz or feldspar, which are cemented together by minerals like silica, calcium carbonate, or iron oxide. This process, called lithification, occurs over millions of years in environments like beaches, deserts, and river deltas.
Uses & applications
Extensively used as a construction material for buildings and paving due to its durability. In industry, it is a source of silica for glass manufacturing. It is also used as a decorative stone in landscaping.
Geological facts
Sandstone can preserve fossilized footprints and ripple marks from ancient environments. It often acts as a significant aquifer, storing large quantities of groundwater or oil due to its porosity.
Field identification & locations
Identify in the field by its gritty, sandpaper-like texture and visible layers (bedding planes). It is commonly found in sedimentary basins and arid regions globally. Collectors look for unique banding or fossil inclusions.
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Sandstone
Arenite (primarily SiO2)
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