General Information:
Chemical Formula:(Li,Na)Mn++4[Si5O14(OH)]
Composition:(Molecular Weight = 612.13 gm)Sodium 0.94 %
NaLithium 0.85 %
LiManganese 35.90 %
MnSilicon 22.94 %
SiHydrogen 0.16 %
H Oxygen 39.21 %
O Empirical Formula: Li0.75Na0.25Mn2+4Si5O14(OH)
Environment:Forms a series with natronambulite.
IMA Status:Approved IMA 1973
Locality:Funakozawa mine, Kitakami Mountains, Iwate Prefecture, Japan.
Name Origin:Named for Matsuo Nambu (1917-), mineralogist, Tohoko University, Japan.
Physical Properties: Cleavage:[001] Perfect, [100] Distinct, [010] Distinct
Color:reddish orange brown.
Density:3.51
Diaphaniety:Transparent to Translucent
Hardness:6.5 - Pyrite
Luster:Vitreous - Adamantine
Streak:light yellow
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