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Zaccagnaite: Zn4Al2(OH)12(CO3)ˇ3(H2O) Zincowoodwardite: [Zn1-xAlx(OH)2][(SO4)x/2(H2O)n]
Comments: White to pale bluish zaccagnaite intimately intergrown with zincowoodwardite.
Location: Hilarion Mine, Agios Konstantinos, Lavrion District, Attikí Prefecture, Greece.
Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag
Zaccagnaite: Zn4Al2(OH)12(CO3)ˇ3(H2O) Fraipontite: (Zn,Al)3(Si,Al)2O5(OH)4
Comments: Scanning electron microscope image of hexagonal, tapering, prismatic zaccagnaite crystals, covered by a thin crust of fraipontite. (AmMin 86:1294).
Location: Marble quarries of the Carrara basin (Apuan Alps, Italy).
Scale: See Image.
© American Mineralogist