Markcooperite
Markcooperite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Pb₂(UO₂)TeO₆.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 3; specific gravity 8.496; Pale orange streak; Adamantine luster; optically biaxial.
IMA symbol Mcp, IMA status: approved, named in 2009.
A secondary phase on fracture surfaces and in small vugs in quartz veins. Formed from the partial oxidation of primary sulfides (e.g., galena) and tellurides (e.g., hessite) during or following brecciation of the quartz veins.
It is found associated with Bromian chlorargyrite, iodargyrite, khinite-4O, wulfenite, housleyite, thorneite, ottoite, timroseite.
The mineral was named to honor Mark A. Cooper (b. 1963), University of Manitoba, for his contributions to mineralogy. He has been involved in the description of many new minerals (~35).