This indicates that there is a wide miscibility gap between the two end members, and it is doubtful whether a complete series exists between jarosite and natrojarosite.
3.
The binder is unknown but the mineral pigments include iron oxides, producing reds and purples; kaolin, producing white; natrojarosite, producing yellow; and manganese oxide, which makes black.
4.
In the jarosite-natrojarosite series Na substitutes for K to at least Na / K = 1 : 2.4 but the pure sodium end member NaFe 3 + 3 ( SO 4 ) 2 ( OH ) 6 is not known in nature.
5.
End member formation ( jarosite and natrojarosite ) is favoured by a low temperature environment, less than 100 �C, and is illustrated by the oscillatory zoning of jarosite and natrojarosite found in samples from the Apex Mine, Arizona, and Gold Hill, Utah.
6.
End member formation ( jarosite and natrojarosite ) is favoured by a low temperature environment, less than 100 �C, and is illustrated by the oscillatory zoning of jarosite and natrojarosite found in samples from the Apex Mine, Arizona, and Gold Hill, Utah.
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