Clerite
Clerite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula MnSb₂S₄.
It crystallizes in the orthorhombic crystal system (space group Pnam). It is a member of the Berthierite structural group.
Key properties: specific gravity 4.48; Submetallic. Anisotropism: Strong; yellow-brown. Bireflectance: Distinct. R1 –R2: (400) —, (420) 24.8–35.6 luster.
IMA symbol Cle, IMA status: approved, named in 1995.
Found in a hydrothermal gold deposit in limestone.
It is found associated with Realgar, pyrite, alabandite, sphalerite, aktashite, routhierite, zinkenite, chalcostibite, orpiment, stibnite, cinnabar, tetrahedrite–tennantite, gold, greigite.
The mineral was named to honor Onisima Yegorovicha Klera (1845–1920), Russian geologist, President of the Ural Society of Natural Sciences Amateurs, Ykaterinberg (Sverdlovsk), Russia.