mineral

Tumbled dark stone, possibly hematite

Hematite (Fe₂O₃), provisional identification

AI-generated identification · may be incorrect

Small, smooth, polished black-to-dark-gray pebble with subdued metallic-to-glassy luster; hematite has Mohs hardness 5–6.5, no prominent cleavage, and specific gravity about 5.0–5.3. The image is too blurred for definitive identification; it could also be magnetite, basalt, or another dark tumbled mineral.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Hematite forms through oxidation in iron-rich sedimentary, hydrothermal, and metamorphic environments; deposits range from Precambrian banded iron formations to younger weathering zones. Tumbled specimens are mechanically polished rather than naturally rounded.

Uses & applications

Hematite is an important iron ore and is used for pigments, abrasives, and ornamental stones; polished pieces are sold as inexpensive jewelry and metaphysical specimens.

Geological facts

A red streak on unglazed porcelain is characteristic of hematite, while magnetite produces a black streak and is strongly magnetic. Hematite itself is usually weakly magnetic or nonmagnetic.

Field identification & locations

Test streak, magnetism, and density; a strong magnet suggests magnetite, whereas a red-brown streak strongly supports hematite. Common sources include Brazil, Australia, South Africa, and the United States.