the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > spinel group AB2 O4 (39)
= spinel, n. 1b 2 (cf. 2).
Mineralogy. = spinel, n. 2.
Mineralogy. The typical species of a group of minerals (the spinel group), which are compounds of sesquioxides with protoxides, and crystallize in…