sedimentary

Reddish-brown rock fragment, possibly iron-stained sandstone

Unidentified iron-oxide-stained rock; sandstone is a tentative visual identification

AI-generated identification · may be incorrect

Rough, opaque, reddish-brown and apparently fine-grained, with an irregular fracture. Hardness, mineral composition, and specific gravity cannot be reliably determined from the image alone.

Identified September 26, 2026More sedimentary →

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Physical properties

Rough, opaque, reddish-brown and apparently fine-grained, with an irregular fracture. Hardness, mineral composition, and specific gravity cannot be reliably determined from the image alone.

Formation & geological history

If sandstone, it formed from compacted and cemented sand grains; iron oxides can impart the red-brown color. Its geological age and exact formation environment are unknown.

Uses & applications

A fragment this size has little industrial use; it may serve as a teaching or casual display specimen if identified.

Geological facts

Red coloration commonly comes from hematite or other iron-oxide coatings, but color alone does not establish the rock type.

Field identification & locations

The image shows a small, rough, rusty-colored specimen with no clearly visible diagnostic grains or crystals. A fresh broken surface, hand lens, and hardness test would help distinguish sandstone from iron-rich or other rocks.