Magnesiosadanagaite
General Information:
Chemical Formula:(K,Na)Ca2(Mg,Fe++,Al,Ti)5[(Si,Al)8O22](OH)2
Composition:(Molecular Weight = 900.44 gm)Potassium 3.26 %
K Sodium 0.64 %
NaCalcium 8.90 %
CaMagnesium 6.75 %
MgTitanium 1.33 %
TiAluminum 8.24 %
AlIron 9.30 %
FeSilicon 18.71 %
SiHydrogen 0.22 %
H Oxygen 42.64 %
O Empirical Formula: K0.75Na0.25Ca2Mg2.5Fe2+1.5Al0.75Ti0.25(Si6Al2O22)(OH)2
Environment:Banded skarns and recrystallized limestones.
IMA Status:Approved IMA
Locality:Myojin Island, Ehime Prefecture, Japan.
Name Origin:Named for the composition and for Ryoichi Sadanaga (1920-), professor emeritus, University of Tokyo.
Physical Properties: Cleavage:[110] Perfect
Color:dark brown or black.
Density:3.27
Diaphaniety:Transparent to Translucent
Hardness:6 - Orthoclase
Luster:Vitreous (Glassy)
Streak:light brown
More details...
General Information: Chemical Formula:(K,Na)Ca2[Mg3(Al,Fe+++)2][Si5Al3O22](OH)2
Composition:(Molecular Weight = 872.23 gm)Potassium 3.36 %
K Sodium 0.66 %
NaCalcium 9.19 %
CaMagnesium 8.36 %
MgAluminum 10.05 %
AlIron 4.80 %
FeSilicon 19.32 %
SiHydrogen 0.23 %
H Oxygen 44.02 %
O Empirical Formula: K0.75Na0.25Ca2Mg3Al1.25Fe3+0.75(Si6Al2O22)(OH)2
IMA Status:Proposed IMA (Dana # Added)
Name Origin:Named for the composition and for Ryoichi Sadanaga (1920-), professor emeritus, University of Tokyo.
More details...
(K,Na)Ca2(Mg,Fe,Al,Fe,Ti)5(Si,Al)8O22(OH)
