mineral

Polished hematite pebble

Hematite, Fe₂O₃

AI-generated identification · may be incorrect

Likely metallic to submetallic dark gray-black hematite, with a smooth polished surface and uneven/conchoidal edges; Mohs hardness 5–6.5, high density (specific gravity about 5.3), opaque, and commonly weakly magnetic or nonmagnetic.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Hematite forms through oxidation of iron-bearing minerals, hydrothermal activity, sedimentary deposition, or metamorphism; specimens range from Precambrian to recent geological ages. This small piece appears shaped or polished for jewelry or collecting.

Uses & applications

Used as an iron ore, pigment, polishing compound, and ornamental stone in beads and carvings; this specimen has modest decorative value.

Geological facts

A diagnostic feature is its red-to-reddish-brown streak, even when the specimen itself is black or metallic gray. It can be confused with magnetite, which is typically strongly magnetic.

Field identification & locations

Commonly found in banded iron formations and iron-rich sedimentary deposits, especially in Brazil, Australia, India, South Africa, and the United States. Test an uncoated area with a streak plate; a red streak strongly supports hematite identification.