General Information:
Chemical Formula:
Fe+++4(AsO4)3(SO4)(OH)·15(H2O)
Composition:
(Molecular Weight = 1,023.45 gm)
Iron 21.83 % Fe
Arsenic 21.96 % As
Hydrogen 3.05 % H
Sulfur 3.13 % S
Oxygen 50.03 % O
Empirical Formula:
Fe3+4(AsO4)3(SO4)(OH)·15(H2O)
IMA Status:
Approved IMA 1978
Locality:
Kank, near Kutna Hora, Czech Republic.
Name Origin:
Named for Vaclav Zyka (1926-), Czech geochemist.
Physical Properties:
Color:
greenish white or gray white.
Density:
2.5
Diaphaniety:
Translucent
Habits:
Nodular - Tuberose forms having irregular protuberances over the surface., ,
Hardness:
2 - Gypsum
Luster:
Earthy (Dull)
Streak:
white
More details...