sedimentary
Riverstone (Sandstone or Quartzite)
Sedimentary Rock (likely Arenite)
Hardness: 6-7 Mohs; Color: Brown, tan, and reddish with dark inclusions; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None.
- Hardness
- 6-7 Mohs
- Color
- Brown, tan, and reddish with dark inclusions
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Brown, tan, and reddish with dark inclusions; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years. This specimen shows significant rounding, indicating it was weathered and transported by water in a river or coastal environment.
Uses & applications
Primarily used in landscaping, construction aggregate, and as decorative garden stones. Larger deposits are quarried for building stone.
Geological facts
Sandstone represents about 20-25% of all sedimentary rocks on Earth. The dark spots on this specimen are likely manganese dendrites or concentrated iron oxide inclusions common in fluvial environments.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible grains. Commonly found in riverbeds, glacial tills, and ancient sedimentary basins. Collectors often look for unique shapes like this rounded heart-like form.
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