sedimentary

Riverstone (Sandstone or Quartzite)

Sedimentary Rock (likely Arenite)

AI-generated identification · may be incorrect

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

Identified July 10, 2026More sedimentary →

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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.