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Ettringite: Ca6Al2(SO4)3(OH)12·26(H2O)
Comments: Doubly-terminated crystals of glassy yellow ettringite on matrix. Location: N'Chwaning Mine, near Kuruman, South Africa. Scale: Crystal size 4 cm. © Rob Lavinsky
Comments: Small glassy whitish micro crystals of ettringite on a white powdery matrix. Location: Ettringen, Eifel, Allemagne, Germany. Scale: 2.5 x 1 x 2 cm. © John Veevaert