mineral
Magnetite (Lodestone variant potential)
Magnetite (Fe3O4)
Hardness: 5.5-6.5 Mohs. Color: Black to brownish-black. Luster: Metallic to submetallic. Crystal structure: Isometric/Octahedral. Specific gravity: 5.17-5.18. It is highly magnetic.
- Hardness
- 5
- Color
- Black to brownish-black
- Luster
- Metallic to submetallic
Identified More mineral →
Explore Magnetite (Lodestone variant potential) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 5.5-6.5 Mohs. Color: Black to brownish-black. Luster: Metallic to submetallic. Crystal structure: Isometric/Octahedral. Specific gravity: 5.17-5.18. It is highly magnetic.
Formation & geological history
Commonly forms as an accessory mineral in igneous and metamorphic rocks, as well as in banded iron formations through sedimentary processes. Can be found in beach sands as heavy mineral deposits.
Uses & applications
The primary ore of iron. Used in industrial manufacturing, heavy media separation, and as a magnetic pigment. Historically used in early compasses (as lodestone).
Geological facts
Magnetite is the most magnetic of all the naturally occurring minerals on Earth. Naturally magnetized pieces called lodestones were used by ancient mariners to navigate at sea.
Field identification & locations
Identify in the field using a handheld magnet; it will strongly attract. It also leaves a black streak. Common in basalt, gabbro, and granite. Collectors look for well-formed octahedral crystals.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous