sedimentary
Sandstone (with Rock Art)
Sandstone (Clastic Sedimentary Rock)
Hardness: 6-7 (Mohs); Color: Tan, brown, ochre; Luster: Dull/Earthy; Structure: Clastic, fine to medium-grained; Cleavage: None
- Hardness
- 6-7 (Mohs)
- Color
- Tan, brown, ochre
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, brown, ochre; Luster: Dull/Earthy; Structure: Clastic, fine to medium-grained; Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments, typically Quartz or Feldspar, over millions of years in basins or desert environments.
Uses & applications
Historically used as a canvas for petroglyphs and pictographs; modern uses include construction stone, paving, and decorative architectural elements.
Geological facts
The rock in the image features ancient rock art (pictographs), often created by indigenous cultures using natural pigments like hematite (red) and charcoal (black).
Field identification & locations
Identified by its gritty sandpaper-like texture and visible layering (bedding planes). Found globally in sedimentary basins. Collectors value specimens for their texture or historical association, though rock art sites are protected by law.
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