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Schorl: NaFe++3Al6(BO3)3Si6O18(OH)4
Comments: Parallel grouping of sharp, black schorl crystals showing terminations. Location: Davib Ost, Erongo Mountains Namibia. Scale: Crystal size: 1.7 x 1.4 cm. © Fabre Minerals
Schorl: NaFe++3Al6(BO3)3Si6O18(OH)4 Albite: NaAlSi3O8
Comments: Several jet-black lustrous crystals of schorl perched on a white albite matrix. Location: Shengus, Gilgit, Pakistan. Scale: 4 x 3 x 2 cm. © Isaias Casanova / IC Minerals
Schorlomite: Ca3(Ti,Fe+++,Al)2[(Si,Fe+++,Fe++)O4]3
Comments: Lustrous massive black schorlomite. Location: Magnet Cove, Hot Spring County, Arkansas, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species