Andorite IV
Andorite is a sulfosalt mineral with the chemical formula PbAgSb3S6. It was first described in 1892 for an occurrence in the Baia Sprie mine, Baia Sprie, in what is now Maramureș County, Romania, and named for Hungarian amateur mineralogist Andor von Semsey (1833–1923). Andorite occurs in low-temperature polymetallic hydrothermal veins. It occurs associated with stibnite, sphalerite, baryte, fluorite, siderite, cassiterite, arsenopyrite, stannite, zinkenite, tetrahedrite, pyrite, alunite, quartz, pyrargyrite, stephanite and rhodochrosite.
Intro adapted from Wikipedia (CC BY-SA).
Andorite IV is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula AgPbSb₃S₆.
It crystallizes in the monoclinic crystal system (space group Pm2a). It is a member of the Lillianite structural group.
IMA symbol Ado IV, grandfathered status — known before the IMA’s founding, named in 1893.