| Niningerite | |
| Category: | Sulfide minerals |
| Formula: | MgS |
| Imasymbol: | Nng[1] |
| Strunz: | 2.CD.10 |
| System: | Cubic |
| Class: | Hexoctahedral (mm) H-M symbol: (4/m 2/m) |
| Symmetry: | Fmm |
| Unit Cell: | a = 5.2 Å; Z = 4 |
| Color: | grey |
| Mohs: | – 4 |
| Luster: | metallic |
| Diaphaneity: | opaque |
Niningerite is a magnesium–iron–manganese sulfide mineral with the chemical formula MgS that is found in enstatite chondrite meteorites.[2] Niningerite is the magnesium-dominant analog of keilite.[3] This mineral is named after Harvey H. Nininger.