sedimentary

Weathered Sandstone or Siltstone

Sedimentary Rock

A relatively soft rock, typically Mohs 6-7, with a dull, earthy luster and composed primarily of quartz or feldspar grains.

Identified August 11, 2026More sedimentary →

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Physical properties

A relatively soft rock, typically Mohs 6-7, with a dull, earthy luster and composed primarily of quartz or feldspar grains.

Formed by the compaction and cementation of sand or silt particles over millions of years, often in riverbeds or coastal environments.

Used historically in construction and dimension stone, but small weathered pieces hold mostly personal collecting value.

Its smooth shape indicates it was likely water-worn, tumbled in a river or surf environment for an extended period.

Identified by its gritty texture and earthy color, commonly found along river banks and beaches.

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Quartz pebble

Silicon dioxide (SiO2)

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)