Knorringite is a mineral species belonging to the garnet group, and forms a series with the species pyrope. It was discovered in 1968 in the Kao kimberlite pipe in the Butha-Buthe District and is named after Oleg Von Knorring at the University of Leeds
Synthetic knorringite has the pure endmember formula Mg3Cr2(SiO4)3. As knorringite is a member of the knorringite - pyrope series, natural samples contain variable aluminium in the chromium Knorringite is a greenish blue color with a Mohs scale of mineral hardness of six to seven.
It occurs as a rare component within ultramafic nodules in kimberlites in association with olivine , chrome diopside , chromian pyrope, chromian spinel, diamond , carbonates. It has been reported from the Red Ledge mine in Nevada County, California in addition to the type location
Knorringite is a tracer mineral in the search for diamonds in kimberlite pipes.