sedimentary

Reddish sandstone or iron-stained quartzite pebble

Likely ferruginous sandstone; possibly quartzite, composed mainly of quartz (SiO₂) with iron oxides

AI-generated identification · may be incorrect

Hardness approximately 6–7 Mohs; brick-red to orange-brown, dull to slightly granular luster, and rounded by abrasion. The visible seam and granular texture favor sandstone, though the image cannot confirm cementation or metamorphic recrystallization.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably formed from quartz-rich sand cemented by silica or iron oxides, then weathered and rounded in a stream, beach, or glacial deposit; its exact geological age and locality are indeterminate.

Uses & applications

Common material used as aggregate, paving stone, building stone, and decorative landscaping rock; this small specimen has minimal commercial or jewelry value.

Geological facts

The red coloration typically comes from hematite or related iron-oxide coatings between quartz grains. The diagonal groove may be a natural fracture, bedding feature, or weathering seam.

Field identification & locations

Look for visible sand grains and porous, weaker surfaces for sandstone; a glassy fracture and fused quartz grains suggest quartzite. Common worldwide, especially in iron-rich sedimentary terrains and river gravels.