sedimentary
Sandstone (Quartzose Sandstone)
Arenite
Hardness: 6-7 (on Mohs scale); Color: Tan, brown, or light reddish-orange; Luster: Dull/Earthy; Crystal structure: Clastic (composed of rounded mineral grains); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (on Mohs scale)
- Color
- Tan, brown, or light reddish-orange
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Tan, brown, or light reddish-orange; Luster: Dull/Earthy; Crystal structure: Clastic (composed of rounded mineral 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, typically through hydraulic action in rivers, lakes, or oceans over millions of years.
Uses & applications
Used primarily in building and paving construction, as a source for glass manufacturing (if high silica), and as a common material for sharpening tools.
Geological facts
Sandstone acts as a natural aquifer and often contains oil and gas deposits due to its high porosity and permeability.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in desert regions and ancient riverbeds. Collectors often look for varieties with 'picture' patterns or fossils.
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