General Information:
Chemical Formula:
K6(Na,K)4Na6Mg10(SO4)12(IO3)12·12(H2O)
Composition:
(Molecular Weight = 4,191.42 gm)
Potassium 6.53 % K
Sodium 4.94 % Na
Magnesium 5.80 % Mg
Hydrogen 0.58 % H
Sulfur 9.18 % S
Iodine 36.33 % I
Oxygen 36.64 % O
Empirical Formula:
K7Na9Mg10(SO4)12(IO3)12·12(H2O)
Environment:
In veins and veinlets of white nitrate ore called caliche blanco.
IMA Status:
Approved IMA
Locality:
A former nitrate mine about 1 km south of the former plant site of Oficina Santa Luisa, Chile.
Name Origin:
For Humberto Fuenzalida P. (1904-1966), who planned and directed the first school of geology at the University of Chile.
Physical Properties:
Cleavage:
[110] Good
Color:
white or pale yellow.
Density:
3.31
Diaphaniety:
Transparent
Habits:
Platy - Sheet forms (e.g. micas)., ,
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Vitreous (Glassy)
Streak:
white
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