Marécottite
Marécottite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Mg₃O₆(UO₂)₈(SO₄)₄(OH)₂·28H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: specific gravity 4.4; optically biaxial.
IMA symbol Mco, IMA status: approved, named in 2001.
A rare alteration product of selenian digenite in the oxidation zone of a uranium-bearing Cu–Co hydrothermal ore deposit.
It is found associated with Digenite, demesmaekerite, denningite, guilleminite.
The mineral was named to honor Aimé Marthoz (1894–1962), former Director of the Union Minière de Haut-Katanga, Congo.
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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