mineral

Black tumbled stone, likely hematite

Hematite (Fe₂O₃); identification is uncertain from the image alone

AI-generated identification · may be incorrect

Smooth, opaque, dark gray-black with a polished metallic-to-submetallic luster; hematite has Mohs hardness 5–6.5 and a trigonal crystal structure, though tumbling obscures its natural form.

Identified September 30, 2026More mineral →

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Physical properties

Smooth, opaque, dark gray-black with a polished metallic-to-submetallic luster; hematite has Mohs hardness 5–6.5 and a trigonal crystal structure, though tumbling obscures its natural form.

Formation & geological history

Hematite forms in sedimentary iron deposits, hydrothermal veins, and as an oxidation product; it occurs in rocks of many geological ages.

Uses & applications

Tumbled hematite is sold for collecting and decorative use; hematite is also an important iron ore and pigment source.

Geological facts

A useful field test for hematite is its reddish-brown streak on unglazed porcelain; the pictured stone cannot be confirmed visually and could be another dark material.

Field identification & locations

Hematite is widespread, including major deposits in Australia, Brazil, and the Lake Superior region. Check the streak and heft; avoid assuming a polished black stone is magnetic hematite.