Interesting minerals of charoite rocks Jerfisherite - Daniel Fisher
The last of the considered by us minerals, found in charoite and named after geologists, mineralogists and naturalists, is djerfisherite. The mineral is weakly stable under surface conditions. Since djerfisherite is an alkaline sulfide with an additional chlorine anion, it cannot impart decorative qualities to charoite. Jerfisherite in charoitites is rare in the form of insignificant grains and very insignificant quantities. The mineral was named by a mineralogist and meteorite researcher at the University of Chicago (Illinois, USA) Louis H. Fuchs (1915-1991) in 1966 in honor of Daniel Jerome (Jerry) Fisher 1896-1988), professor of mineralogy from the same university and one of the presidents of the Mineralogical Society of America (USA).
In gemology, speaking of olivines, they most often mean forsterite (including synthetic, sometimes imitating tanzanite) and chrysolite (a jewelry variety of forsterite with a small amount of fayalite minal), sometimes they recall tephroite, which is part of rhodonite rocks, as well as fayalite.
Everyone knows such minerals associated with carbon and organic matter as diamond and numerous fossil resins, the most prominent representative of which is Baltic amber (succinite or hedano-succinite). But in the bowels of the earth, organic matter can also give other gems, one of which is mellite.