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Ferritschermakite: Ca2(Fe++,Mg)3Al2(Si7Al)O22(OH)2
Comments: Dark amphibolite composed of aggregates of ferritschermakite crystals. Location: Elisenvaara S-W Karelia, Russia. Scale: Specimen size: 12x10x6 mm. © Sergey Vasiliev / Systematic Mineralogy