sedimentary

Sandstone (Stream-rounded)

Arenite (SiO2 based)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Brown to tan with dark inclusions; Luster: Dull/Earthy; Crystal structure: Granular (clastic texture); Cleavage: None; Specific gravity: 2.3-2.6

Hardness: 6-7 (Mohs)
Color: Brown to tan with dark inclusions
Luster: Dull/Earthy

Identified March 24, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Brown to tan with dark inclusions; Luster: Dull/Earthy; Crystal structure: Granular (clastic texture); Cleavage: None; Specific gravity: 2.3-2.6

Formation & geological history

Formed from the accumulation and lithification of sand-sized mineral particles or rock fragments. This specific specimen shows significant fluvial erosion (rounding by water), likely dating from the Holocene to Pleistocene epochs.

Uses & applications

Common varieties are used in construction, road base, and as decorative landscaping stones. Highly pure quartz sandstones are used in glass manufacturing.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Its porosity makes it a critical reservoir rock for groundwater, oil, and natural gas.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in riverbeds, beaches, and desert outcrops. For collectors, look for unique weathering patterns or fossil inclusions.