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Albite: NaAlSi3O8 Plagioclase: (Na,Ca)(Si,Al)4O8
Comments: Colorless, lustrous blocky albite crystals to 3 cm in size with a thick dusting of micaceous green micro chlorite. Location: Acushnet Quarry, Bristol Co., Massachussetts, USA. Scale: 17 x 15 x 7.5 cm matrix. © Dan Weinrich
Comments: Crystal group of bladed albite (variety cleavelandite) crystals. Location: Taquaral, Minas Gerais, Brazil. Scale: 7.4 x 5 cm. © John Veevaert
Albite: NaAlSi3O8 Schorl: NaFe++3Al6(BO3)3Si6O18(OH)4
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