Magnetite (Lodestone variety)
Magnetite · Collector Mineral and Industrial Mineral
Crystal System
Cubic (Isometric); habit is typically octahedral or dodecahedral crystals, commonly found in massive or granular form.
Mineral Group
Oxides (Spinel group)
Chemical Formula
Fe2+Fe3+2O4 (Iron Oxide)
Formation Process
Igneous (crystallization from cooling magma), Metamorphic (contact or regional metamorphism of iron-rich sediments), and Hydrothermal (vein deposits).
About This Crystal
The specimen appears as an opaque, dark grey to black mineral with a metallic to sub-metallic luster. The surface is uneven and granular with small reflective facets. It lacks transparency even in thin sections.
Physical Characteristics
Color: Iron-black to dark grey; Streak: Black; Cleavage: None (distinct octahedral parting); Fracture: Subconchoidal to uneven; Specific Gravity: 5.17-5.18; Magnetic: Strongly magnetic; Fluorescence: None.
Optical Properties
Isotropic (opaque); Refractive Index is not applicable for opaque minerals, but it exhibits high reflectivity. No pleochroism or dispersion.
Hardness & Durability
Origin Region
Kiruna (Sweden), Barberton (South Africa), and various locations in the USA and Russia; typically found in igneous and metamorphic rocks.
Hardness & Durability
Mohs hardness: 5.5 to 6.5; Toughness: Brittle; Stability: Generally stable but can oxidize to hematite or goethite over long periods in moist environments.
Care & Maintenance
Clean with a soft, dry cloth; avoid water which can lead to rusting (oxidation) over time. Store away from electronic devices and magnetic media due to its strong magnetic field.
Rarity & Value
Common mineral; value is generally low for massive specimens but higher for well-formed octahedral crystals or 'lodestone' varieties that exhibit natural polarity.
Special Characteristics
Strong magnetism (ferrimagnetism) is its defining characteristic. Lodestone specimens act as natural magnets that can attract iron filings and small metal objects.
Lore & History
Historically used by ancient civilizations for navigation (the first compasses). In folklore, it was used to 'draw' things to the wearer. In modern crystal healing, it is associated with the Base Chakra and believed to be grounding and stabilizing.