Marathonite
Marathonite is an IMA-recognized mineral species in the native element class, with the chemical formula Pd₂₅Ge₉.
It crystallizes in the hexagonal crystal system (space group P3).
Key properties: specific gravity 10.933; Metallic luster.
IMA symbol Mth, IMA status: approved, named in 2016.
Found in heavy mineral separates from olivine gabbro.
It is found associated with Vysotskite, Au-Ag alloy, isoferroplatinum, Ge-bearing keithconnite, majakite, coldwellite, ferhodsite-series minerals (cuprorhodsite-ferhodsite), kotulskite.
The name refers to Marathon, Ontario, Canada, after which the Marathon Cu-PGE deposit (Coldwell complex) is named.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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