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Corundum: Al2O3
Comments: corundum (variety Sapphire). Location: Miass, Urals, Russia. Scale: 10 x 8 cm. © Fabre Minerals
Corundum: Al2O3 Zincohogbomite-2N2S: (Zn,Fe++)(2-2x)(Ti)xAl4O8
Comments: Thin-Section (Plane Polarized Light) of a brown, twinned zincohögbomite-2N2S crystal with blue corundum. Location: Mikro-Lakka Emery deposit, Kerketeas Mt, Sámos Island, Aegean Islands Department, Greece. Scale: Picture size 1.1 mm. © Thomas Witzke / Abraxas-Verlag
Comments: Bright red ruby corundum crystals in white marble matrix. Location: Jagdalak (Jagdalek; Jagdalik) Ruby Mine, Sorobi District, Konar (Kunar; Konarh; Konarha; Nuristan) Province, Afghanistan. Scale: 4x3.5x3 cm. © John Betts - Fine Minerals