sedimentary

Weathered sandstone or arkosic sandstone

Clastic sandstone, likely quartz–feldspar-rich (arkose)

AI-generated identification · may be incorrect

Coarse, granular texture with tan-brown coloration and reddish iron-oxide staining; typically Mohs hardness 6–7 for quartz grains, dull to slightly gritty luster, no obvious cleavage, and variable porosity. The image does not show enough detail for confident mineral identification.

Identified August 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted and cemented sand, probably in a river, alluvial-fan, or desert environment; the red color reflects oxidation of iron-bearing minerals. Its precise geologic age cannot be determined from the photograph.

Uses & applications

Commonly used as building stone, paving, aggregate, and sometimes landscaping material; ordinary hand specimens generally have little commercial or jewelry value.

Geological facts

Sandstone commonly preserves sedimentary structures such as bedding, cross-bedding, and ripple marks, although none are clearly visible here. Arkose is distinguished by abundant pink feldspar grains, often derived from rapidly eroding granite.

Field identification & locations

Look for visibly individual sand grains, gritty texture, and possible layering; a streak, magnifier, and acid test can help distinguish it from quartzite or weathered igneous rock. Common worldwide, especially in sedimentary basins and arid regions.