mineral

Likely tumbled hematite-rich ironstone

Hematite, Fe₂O₃, possibly mixed with goethite or magnetite

AI-generated identification · may be incorrect

Small rounded, polished dark gray-brown specimen with metallic to submetallic luster and reddish-brown streak potential; hematite hardness is 5–6.5 Mohs, with no prominent cleavage and a trigonal crystal structure.

Identified September 13, 2026More mineral →

Explore Likely tumbled hematite-rich ironstone in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Iron oxides form through oxidation, weathering, hydrothermal activity, or sedimentary concentration of iron; the specimen was likely naturally rounded and subsequently tumbled or polished. Exact geological age cannot be determined from the image.

Uses & applications

Used as an iron ore, pigment, polishing compound, and ornamental stone; common tumbled pieces have modest collector value.

Geological facts

A diagnostic hematite streak is red to reddish-brown, even when the surface appears metallic black. Strong magnetism would suggest magnetite or a mixture rather than pure hematite.

Field identification & locations

Common worldwide, especially in banded iron formations and weathered iron-rich deposits; major sources include Brazil, Australia, South Africa, and the Lake Superior region. Test streak on unglazed ceramic and magnetism, but avoid scratching valuable surfaces.