Magnetite
Magnetite · Mineral Specimen and Ore Mineral
Crystal System
Cubic, often forming octahedral or dodecahedral crystals, typically found as massive or granular aggregates
Mineral Group
Oxides
Chemical Formula
Fe2+Fe3+2O4
Formation Process
Igneous, metamorphic, and sedimentary processes, often crystallizing from cooling magmas or through hydrothermal alteration
About This Crystal
An opaque, dark gray to black metallic mineral with a submetallic to metallic luster, showing crystalline granular texture and strong magnetic attraction
Physical Characteristics
Color is iron-black to dark gray; streak is black; cleavage is none, parting on octrahedral planes; fracture is uneven; specific gravity is around 5.15; strongly magnetic
Optical Properties
Opaque with a metallic luster; isotropic under reflected plane-polarized light
Hardness & Durability
Origin Region
Found worldwide, with notable deposits in Sweden, Norway, Russia, South Africa, and the USA (Adirondacks)
Hardness & Durability
Mohs hardness of 5.5 to 6.5; brittle tenacity; fair durability but sensitive to strong acids
Care & Maintenance
Keep dry to prevent oxidation and rusting; clean with a soft dry brush, avoiding harsh chemicals and prolonged water exposure
Rarity & Value
Common mineral, though high-grade crystal specimens or lodestones hold value for collectors
Special Characteristics
Strongly magnetic; naturally occurring magnets are known as lodestones
Lore & History
Historically known as the lodestone, used in ancient navigation instruments such as early compasses; in metaphysical practices, it is associated with grounding, attracting positive energy, and aligning the chakras