Figure 8
Variation of pseudohexagonal lattice parameters with time for formation of monoclinic jarosite in the Na series along with the lattice parameters from the minor rhombohedral phase formed at 393 K. The line corresponds to the stoichiometric solid solution NaFe3(SO4)2(OH)6–H3OFe3(SO4)2(OH)6 (from Basciano & Peterson, 2008). Black diamonds = 353 K; grey squares = 368 K; white circles = 393 K, monoclinic; black circles = 393 K, rhombohedral. |