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Raman spectroscopy has been used to characterise the jarosite group of minerals of formula Mn(Fe3+)6(SO4)4(OH)12 where M may be K, (NH4)+, Na, Ag or Pb and where n=2 for monovalent cations and 1 for the divalent cations. Raman spectroscopy proved useful for mineral identification especially where closely related minerals crystallise out from solutions where paragenetic relationships exist between...
The thermal decomposition of argentojarosite has been studied by thermogravimetric, spectroscopic and infrared emission techniques. Dehydroxylation occurs in three stages at 228, 383, 463°C with the loss of 2, 3 and 1 hydroxyl units. Loss of sulphate occurs at 548°C and is associated with a loss of oxygen. At 790°C loss of oxygen only leaves metallic silver and hematite. Changes in the structure of...
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