General Information:
Chemical Formula:Mg0.5[Mn++Fe+++(TeO3)3]·4.5(H2O)
Composition:(Molecular Weight = 730.80 gm)Magnesium 1.66 %
MgManganese 7.52 %
MnIron 7.64 %
FeTellurium 52.38 %
TeHydrogen 1.24 %
H Oxygen 29.56 %
O Empirical Formula: Mg0.5Mn2+Fe3+(TeO3)3·4.5(H2O)
Environment:Mn-dominant analog of zemannite and keystoneite. With other Te oxy-salts.
IMA Status:Approved IMA 1981
Locality:Kawazu mine, Shimada, Izu Peninsula, Japan.
Name Origin:Named for Kin-Ichi Sakuai (1912-), Japanese amateur mineralogist and collector, coauthor of "Minerals of Japan" 1938.
Physical Properties: Cleavage:None
Color:dark brown.
Density:3.96
Habits:Hexagonal - Six-sided crystal shape in cross-section or habit., Crystalline - Fine - Occurs as well-formed fine sized crystals.,
Hardness:2 - Gypsum
Luster:Subadamantine
Streak:brown
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