General Information:
Chemical Formula:
Mg0.5[Mn++Fe+++(TeO3)3]·4.5(H2O)
Composition:
(Molecular Weight = 730.80 gm)
Magnesium 1.66 % Mg
Manganese 7.52 % Mn
Iron 7.64 % Fe
Tellurium 52.38 % Te
Hydrogen 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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