Black crystals of the rare lead mineral magnetoplumbite from Langban (Sweden). — Photo: David Hospital · CC BY-SA 4.0
Magnetoplumbite
A lead-iron oxide of the magnetoplumbite group, first described from Långban, Sweden.
Intro adapted from Wikipedia (CC BY-SA).
Magnetoplumbite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula PbFe³⁺₁₂O₁₉.
It crystallizes in the hexagonal crystal system (space group P6_3/mmc). It is a member of the Magnetoplumbite structural group.
Key properties: Mohs hardness 6; specific gravity 5.517; Dark brown streak; Metallic, brilliant luster; optically uniaxial.
IMA symbol Mpl, IMA status: approved, named in 1925.
Found in skarns in association with metamorphosed Fe–Mn orebodies (Sweden).
It is found associated with Melanotekite-kentrolite, hematite, jacobsite, hedyphane, braunite, pyrophanite, manganoan phlogopite, calcite, andradite, celsian (Sweden).
The name refers to being a MAGNETic oxide of iron, manganese, and lead, plumbum.