Sapphirine on Matrix | dark blue crystal, rare mineral specimen from MadagascarSapphirine is a rare magnesium aluminum silicate mineral completely distinct from sapphire despite the similarity in name. This specimen from Madagascar features dark blue opaque sapphirine perched dramatically on biotite and sillimanite matrix, highlighting the minerals rich coloration and natural sculptural form. Highly valued by collectors for its rarity and well formed crystals, Madagascan sapphirine is prized for its mineralogical significance