Thalliomelane
Thalliomelane is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula TlMn⁴⁺₇.₅Cu²⁺₀.₅O₁₆.
It crystallizes in the tetragonal crystal system (space group I4/m). It is a member of the Coronadite structural group.
Key properties: specific gravity 5.37.
IMA symbol Tml, IMA status: approved, named in 2019.
Precipitated from a mixture of Cl-, Br-, and I-bearing brines and pore waters during weathering of a sulfide mineral assemblage under semi-arid to arid climate. Tl likely transported from depth along fractures.
It is found associated with Cuprite, malachite, iodargyrite.
Indicates the main constituent (Tl) and the affinity to dark-colored manganese oxides.
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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