Magnetite
Magnetite · Mineral Specimen
Crystal System
Cubic (Isometric), octahedral or dodecahedral habit, massive or granular
Mineral Group
Oxides
Chemical Formula
Fe3O4
Formation Process
Igneous, metamorphic, and sedimentary processes; forms in magmatic deposits, high-temperature hydrothermal veins, and metamorphic rocks
About This Crystal
Opaque, dark metallic black to iron-black mineral specimen with a rough, uneven, and somewhat pitted surface showing crystalline structure embedded in matrix
Physical Characteristics
Color: Iron-black to brownish-black; Streak: Black; Cleavage: None; Fracture: Uneven to subconchoidal; Specific Gravity: 5.15 to 5.18; Tenacity: Brittle; Highly magnetic
Optical Properties
Opaque, isotropic, metallic luster showing strong reflectivity under incident light
Hardness & Durability
Origin Region
Worldwide, notable deposits in Sweden, USA (New York, Utah), South Africa, and Russia
Hardness & Durability
Mohs hardness: 5.5 to 6.5; brittle toughness; stable under normal conditions
Care & Maintenance
Clean with mild soapy water and a soft brush; avoid harsh chemicals and prolonged moisture to prevent surface oxidation/rusting
Rarity & Value
Common mineral, widespread globally; value depends on crystal perfection, octahedral form, and size of the specimen
Special Characteristics
Strong natural magnetism (lodestone variety exhibits permanent polarity); metallic luster
Lore & History
Historically known as lodestone; used in ancient times for early compass navigation; associated in crystal healing with grounding, balance, and attracting positive energy