Spinel jẹ nkan ti o wa ni erupe ile ti o ni iṣuu magnẹsia ati ohun elo afẹfẹ aluminiomu, nitori pe o ni iṣuu magnẹsia, irin, zinc, manganese ati awọn eroja miiran, wọn le pin si ọpọlọpọ awọn iru, gẹgẹbi aluminiomu spinel, spinel iron, zinc spinel, manganese spinel, chrome spinel ati bẹ bẹ lọ.