mineral

Likely tumbled hematite or hematite-rich ironstone

Hematite (Fe₂O₃), possibly magnetite-bearing ironstone

AI-generated identification · may be incorrect

Smooth rounded pebble with dull metallic-to-earthy gray surface and reddish-brown tones; hematite hardness is 5–6.5 Mohs, specific gravity about 5.0–5.3, and it commonly has no visible cleavage. The image alone cannot confirm whether it is hematite, magnetite, or another dark tumbled stone.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Hematite forms by oxidation of iron-rich minerals in sedimentary, hydrothermal, and metamorphic environments; many polished specimens derive from Precambrian banded iron formations, roughly 2.5–3.8 billion years old.

Uses & applications

Used as an iron ore and pigment; polished hematite is sold as an ornamental and jewelry stone. Ironstone specimens are mainly collected for appearance and density.

Geological facts

A diagnostic reddish-brown streak on unglazed porcelain strongly supports hematite; magnetite produces a black streak and is noticeably magnetic.

Field identification & locations

Commonly found in Brazil, Australia, China, India, and the Lake Superior region. Test streak, magnetism, and unusually high density; a strong magnet suggests magnetite-rich material.