KnowraSpinelLinked fromLinked fromThe 4 pages that link to Spinel, each with the reason it gives.All 4Broader topic 2Compared with 2CorundumCompared with: Spinel has historically been mistaken for ruby despite having a different composition and structure.Silicon–oxygen tetrahedronCompared with: Contrasts with silicates: here oxygen packs first and cations fill interstices, rather than tetrahedra building the structure.