sedimentary
Sandstone (likely Calcareous or Quartz-rich)
Arenite (SiO2 based typically)
Hardness: 6-7 on Mohs scale (if quartz-based); Color: light grey to tan; Luster: dull/earthy; Crystal structure: granular clastic texture; Cleavage: none; Specific gravity: 2.2-2.8.
- Hardness
- 6-7 on Mohs scale (if quartz-based)
- Color
- light grey to tan
- Luster
- dull/earthy
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Physical properties
Hardness: 6-7 on Mohs scale (if quartz-based); Color: light grey to tan; Luster: dull/earthy; Crystal structure: granular clastic texture; Cleavage: none; Specific gravity: 2.2-2.8.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river, lake, or marine environments. This specimen shows a weathered clastic texture likely from a recent geological period.
Uses & applications
Used primarily in construction for building stone, road base, and as a reservoir rock in the petroleum industry. Also used for decorative landscaping.
Geological facts
Sandstone accounts for approximately 20% of all sedimentary rocks on Earth. It is porous enough to act as a significant aquifer for groundwater.
Field identification & locations
Identify in the field by its 'sandpaper' feel and visible grains. If it fizzes with cold dilute HCl, it is calcareous sandstone. Found globally in basins and coastal regions.
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