mineral

Iron-rich rock, possibly hematite-bearing ironstone

Likely hematite (α-Fe₂O₃) or a hematite-rich ironstone; exact identification requires testing

AI-generated identification · may be incorrect

Rough, massive, reddish-brown to dark gray with a subdued metallic sheen. Hematite has Mohs hardness about 5–6.5, trigonal crystal structure, and a diagnostic red-brown streak; no obvious cleavage.

Identified October 9, 2026More mineral →

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Physical properties

Rough, massive, reddish-brown to dark gray with a subdued metallic sheen. Hematite has Mohs hardness about 5–6.5, trigonal crystal structure, and a diagnostic red-brown streak; no obvious cleavage.

Formation & geological history

Iron oxides commonly form by chemical precipitation, weathering, or hydrothermal processes. The image alone cannot establish the specimen’s age or specific formation environment.

Uses & applications

Hematite is an important iron ore and is also used as a pigment and ornamental stone; these rough pieces appear mainly suitable for collecting.

Geological facts

A red-brown streak on unglazed porcelain is a useful hematite clue, while magnetism varies and is often weak or absent.

Field identification & locations

The lumpy, rusty appearance is consistent with iron-rich material, but other iron minerals can look similar. Check streak and hardness, or have it tested; hematite occurs worldwide in iron formations and weathered deposits.