Knorringite is a mineral species belonging to the garnet group and forms a series with the species pyrope. It was discovered in 1968 and is named after Oleg Von Knorring, a professor of mineralogy at the University of Leeds in England. Knorringite's chemical formula is Mg3Cr2(SiO4)3. Knorringite is a green, blue color with a Mohs scale of mineral hardness of six to seven. Knorringite is a tracer mineral in the search for diamonds in kimberlite pipes.