sedimentary

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: tan, brown, or buff with iron oxide staining, Luster: dull/earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific gravity: 2.2-2.8

Identified March 29, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: tan, brown, or buff with iron oxide staining, Luster: dull/earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments (clasts). Typically formed in river beds, beaches, or deserts; ages range from Precambrian to Recent.

Uses & applications

Commonly used as a building material, road base, abrasive for polishing, and as an aquifer for groundwater or a reservoir for petroleum.

Geological facts

Sandstone accounts for approximately 20% of all sedimentary rocks on Earth. The specimen shows 'bioturbation' marks, which are the preserved tracks or burrows of ancient organisms that lived in the sediment.

Field identification & locations

Identify by its gritty, 'sandpaper' feel and visible grains. Found worldwide in sedimentary basins. Collectors should look for unique weathering patterns or fossilized inclusions.