Spinel crystalizes in the form of rolled pebbles, cubes, twinned aggregates, and octahedral crystals exhibiting, sometimes, dodecahedral terminations. Spinel was first reported in 1779 by J. Demeste and was named for the Latin word "spinella" meaning "little thorn", referring to the spine-shaped octahedral crystals. 

Spinel Octahedron

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