Kalininite
A zinc-chromium thiospinel found in 1985 in the Pereval marble quarry near Lake Baikal.
Intro adapted from Wikipedia (CC BY-SA).
Kalininite is an IMA-recognized mineral species in the sulfide class, with the chemical formula ZnCr₂S₄.
It crystallizes in the cubic crystal system (space group Fd-3m). It is a member of the Spinel structural group.
Key properties: specific gravity 4.045; Adamantine. R: (400) —, (420) —, (440) 34.4, (460) 35.2, (480) 35.3, (500) 35.4, (520) 35.4, (540) 35.2, (560) 35.3 luster.
IMA symbol Kal, IMA status: approved, named in 1984.
Found in a garnet-pyroxene mixture in diopside-quartz-calcite rocks.
It is found associated with Karelianite, eskolaite, diopside, quartz, calcite, barite, zircon, chromian-vanadian tremolite, goldmanite–uvarovite, pyrite.
The name refers to Pavel Vasil’evich Kalinin (1905–1981), Russian mineralogist and petrologist, Moscow Geological Exploration Institute, investigator of the southern Baikal region.