sedimentary
Sandstone
Arenite (specifically Iron-stained Quartz Sandstone)
Hardness: 6-7 (individual grains); Color: Tan, yellow, or orange due to iron oxide; Luster: Dull/Earthy; Structure: Clastic, granular; Cleavage: None/Fragmentary; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (individual grains)
- Color
- Tan, yellow, or orange due to iron oxide
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (individual grains); Color: Tan, yellow, or orange due to iron oxide; Luster: Dull/Earthy; Structure: Clastic, granular; Cleavage: None/Fragmentary; Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and cementation of sand-sized mineral particles or rock fragments. Likely Triassic or Cretaceous based on regional NC geology, deposited in riverbeds or coastal environments.
Uses & applications
Primarily used as construction stone, paving, and occasionally for filtration or as a source of silica for glass manufacturing.
Geological facts
Sandstone is highly porous and often acts as a natural aquifer, storing groundwater or oils between the sand grains.
Field identification & locations
Identify by its rough, sandpaper-like texture and visible sand grains. Highly common in the Durham/Raleigh (NC) Triassic Basin areas.
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