Knopite is a mineral, a rare variety of perovskite. It is characterized by a high content of rare earth elements (up to 10%). The name of the mineral comes from the name of the German mineralogist A. Knop. Knopite is characterized by octahedral and cuboctahedral crystals. Color black or lead grey. It is typical for massifs of basic alkaline rocks and carbonatites.
You can see knopite stone for sale and buy it in the Minerals of Russia online store.