General Information:
Chemical Formula:(Na,Li)Mn++4[Si5O14(OH)]
Composition:(Molecular Weight = 619.35 gm)Sodium 2.60 %
NaLithium 0.34 %
LiManganese 35.48 %
MnSilicon 22.67 %
SiHydrogen 0.16 %
H Oxygen 38.75 %
O Empirical Formula: Li0.3Na0.7Mn2+4Si5O14(OH)
Environment:Found in the mine dump.
IMA Status:Approved IMA
Locality:Matsumaezawa ore body, Tahohata mine, Ivate Prefecture, Japan.
Name Origin:Named for its composition and for Matsuo Nambu (1917-), mineralogist, Tohoko University, Japan.
Physical Properties: Cleavage:[100] Perfect, [001] Perfect
Color:pink orange.
Density:3.51
Diaphaniety:Transparent to Translucent
Hardness:5.5-6 - Knife Blade-Orthoclase
Luster:Vitreous (Glassy)
Streak:very pale orange
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