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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