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Native Element

Tomamaeite

Cu₃Pt
Hardness3.5
Crystal systemCubic
ClassNative Element
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Tomamaeite

Tomamaeite is an IMA-recognized mineral species in the native element class, with the chemical formula Cu₃Pt.

It crystallizes in the cubic crystal system (space group Pm-3m). It is a member of the Perovskite, Auricupride structural group.

Key properties: Mohs hardness 3.5; specific gravity 12.4; Metallic luster.

IMA symbol Tmm, IMA status: approved, named in 2020.

Occurs as inclusions in a platinum-group mineral (PGM) grain (Japan); in a native osmium grain from alluvial sediment (Russia).

It is found associated with In Pt-Fe(Cu) alloys such as tulameenite, ferronickelplatinum, tetraferroplatinum, and hongshiite (Japan); osmium (Os0.36Ir0.33Ru0.31), digenite, millerite.

The name refers to the town in Japan near where the first samples were collected.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more T minerals or help write this entry.