Magnetite

Real mineral · common · Fe₃O₄

Iron oxide with strong natural magnetic properties. One of the few minerals that acts as a natural magnet in its lodestone form. Precipitates from igneous melts as one of the first minerals to crystallise during cooling.

Identity

Formula

Fe₃O₄

Chemical class

oxide

Mineral group

Chromite, Spinel

Also known as

Lodestone (natural magnet form), Magnetic iron ore

Crystallography

Crystal system

cubic

Habits

octahedral, dodecahedral, massive

Fracture

subconchoidal

Physical properties

Mohs hardness

6

Density

5.18 g/cm³

Luster

metallic, submetallic

Colors

iron-black, gray

Streak

black

Transparency

opaque

Geology

Origins

igneous, metamorphic, sedimentary

Host rocks

basalt, gabbro, schist

Associated minerals

Hematite, Pyrite, Quartz, Olivine

Geography

worldwide

Classification

Rarity

common

Gem quality

No

Arcane properties

Affinity

earth, storm

Effects

warding

Planar origin

Material Plane

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