SPINEL
- a mineral, also SPINELLE [n -S]
- any of a group of minerals composed principally of oxides of magnesium, aluminum, iron, manganese, chromium, etc., characterized by their hardness and octahedral crystals
- mineral of this group, essentially magnesium aluminate, MgAl2O4, some varieties being used as gems
- a mineral (a naturally occurring inorganic substance having a characteristic set of physical properties) [n SPINELS]