mineral
Likely hematite-rich iron ore
Hematite (Fe₂O₃), possibly with magnetite and/or goethite
AI-generated identification · may be incorrectDark gray to black, metallic-to-submetallic luster, irregular botryoidal or granular surface; hematite has Mohs hardness about 5–6.5 and specific gravity ~5.3, but the specimen’s exact properties require testing.
Identified More mineral →
Explore Likely hematite-rich iron ore in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Dark gray to black, metallic-to-submetallic luster, irregular botryoidal or granular surface; hematite has Mohs hardness about 5–6.5 and specific gravity ~5.3, but the specimen’s exact properties require testing.
Formation & geological history
Forms by oxidation and chemical precipitation in iron-rich environments, including banded iron formations and hydrothermal or weathering zones; deposits range from Precambrian to young secondary ores.
Uses & applications
Used as an iron ore and pigment; attractive polished or crystalline pieces are collected, though this rough specimen likely has modest value.
Geological facts
A reddish-brown streak on unglazed porcelain strongly supports hematite; magnetite instead gives a black streak and is strongly magnetic.
Field identification & locations
Common in iron-rich regions worldwide, including Brazil, Australia, India, South Africa, and the Lake Superior region. Test streak, magnetism, and density; the image alone cannot distinguish hematite confidently from magnetite or slag.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous