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Orthoclase: KAlSi3O8 Lorenzenite: Na2Ti2Si2O9
Comments: Striated, dark violet crystal of lorenzenite in cream-colored orthoclase. Location: Khibiny Massif, Kola Peninsula, Russia. Scale: 1.3 x 1.2 cm. © John Veevaert
Orthoclase: KAlSi3O8
Comments: Carlsbad twinned crystal of orthoclase. Former Martín Oliete Fontela collection. Location: Zarzalejo, Madrid. Scale: 5.2x4.6x2.2 cm. © Fabre Minerals
Comments: Gemmy, twinned adularia (orthoclase) specimen on matrix. Former Bally Museum collection. Location: Rhonegletscher, Switzerland. Scale: Crystal size 3 x 2 cm. © Fabre Minerals