Magnetite
Magnetite is an oxide mineral recognized among collectors for its crystal form and distribution, with several world-class Chinese localities.
About Magnetite
Magnetite is classified as an oxide mineral in the spinel supergroup > oxyspinel group and has the chemical formula Fe2+Fe3+2O4. It crystallizes in the isometric system and has a distinctive metallic presence in any collection. Its combination of structural character and global distribution make it a recognized species in both systematic and aesthetic collections.
Identification & care
Magnetite typically forms octahedral (most characteristic), dodecahedral; massive, granular, lamellar; rounded grains in metamorphic rocks. Its color is typically greyish black or iron black. The luster is metallic, sub-metallic, the streak is black, and specimens are typically opaque. The cleavage is none (parting on {111}, sometimes good). The fracture is irregular/uneven, which aids identification.
Collector context
How it forms
The geological setting for Magnetite is typically common accessory mineral in igneous and metamorphic rocks; major iron ore in banded iron formations; contact metasomatic skarns; black sand beaches. It is commonly found in association with pyrite, pyrrhotite, ilmenite, hematite, chlorite, diopside, grossular.
Classic Chinese localities
**Huanggang Fe-Sn deposit** is an important Chinese source for the species.
Why collectors care
Magnetite is a frequently-sought species in serious collections because its habit is recognizable, its color often strong, and its best examples unmistakable even at a distance. Chinese material has driven much of the recent visual shift in the species — sharper crystals, deeper colors, cleaner matrix.
What affects value
Value in Magnetite is assessed, in typical order of weight, against: (1) locality provenance; (2) size relative to the species norm; (3) crystal form and termination sharpness; (4) color saturation and zoning; (5) transparency and internal clarity; (6) matrix quality and aesthetic balance; (7) condition (absence of damage, chips, or repair). Cleaning quality and verified locality documentation act as multipliers across the above.
Naming history
The name Magnetite has a specific etymological and historical context — see Mindat's reference entry for provenance details. We have retained naming data at the record level; published prose is paraphrased from factual fields rather than copied from source.