sedimentary

Sandstone (Weathered)

Arenite (primarily SiO2)

Hardness: 6-7 (on Mohs scale if quartz-based); Color: Tan, buff, or brownish-yellow; Luster: Dull or earthy; Crystal Structure: Clastic (sand-sized grains); Cleavage: None; Specific Gravity: 2.2–2.8

Hardness: 6-7 (on Mohs scale if quartz-based)
Color: Tan, buff, or brownish-yellow
Luster: Dull or earthy

Identified April 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. Often deposited in riverbeds, deltas, or deserts. This specific specimen shows significant rounded weathering, likely from fluvial (water) action.

Uses & applications

Commonly used as a building material, in the manufacture of glass (if high quartz content), as a reservoir rock in the petroleum industry, and for landscaping.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. It is famous for creating iconic landscapes like the Grand Canyon and Antelope Canyon. Because it is porous, it acts as a natural filter for groundwater.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. These rounded 'river stones' are commonly found in glacier deposits or active/ancient stream beds. Collectors value unique cross-bedding patterns or fossil inclusions.