Nambulite Mineral Data

Nambulite Mineral Data +

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General Nambulite Information

Chemical Formula:

(Li,Na)Mn++4[Si5O14(OH)]

Composition:

Molecular Weight = 612.13 gm

Sodium 0.94 % Na 1.27 % Na₂O

Lithium 0.85 % Li 1.83 % Li₂O

Manganese 35.90 % Mn 46.35 % MnO

Silicon 22.94 % Si 49.08 % SiO₂

Hydrogen 0.16 % H 1.47 % H₂O

Oxygen 39.21 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Li_0.75Na_0.25Mn²⁺₄Si₅O₁₄(OH)

Environment:

Forms a series with natronambulite.

IMA Status:

Approved IMA 1972

Locality:

Funakozawa mine, Kitakami Mountains, Iwate Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Matsuo Nambu (1917-), mineralogist, Tohoko University, Japan.

Synonym:

ICSD 1974

PDF 27-1253

Nambulite Image

Images:

Nambulite

Comments: Brown crystalline nambulite with pinkish rhodonite.
Location: Gozaisho Mine, Iwaki, Fukushima, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nambulite Crystallography

Axial Ratios:

a:b:c =0.6479:1:0.5723

Cell Dimensions:

a = 7.621, b = 11.761, c = 6.731, Z = 2; alpha = 92.77°, beta = 95.08°, gamma = 106.87° V = 574.40 Den(Calc)= 3.54

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.96(1), 2.97(0.8), 2.92(0.7),

Crystal Structure:

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Narita H , Koto K , Morimoto N , Yoshii M , Acta Crystallographica, Section B , 31 (1975) p.2422-2426, The crystal structure of nambulite (Li,Na)Mn4Si5O14(OH)

Physical Properties of Nambulite

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

Optical Properties of Nambulite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2022,KPDmeas= 0.2039,KC= 0.2064

Optical Data:

Biaxial (+), a=1.707, b=1.71, g=1.73, bire=0.0230, 2V(Calc)=44, 2V(Meas)=30. Dispersion r > v weak.

Calculated Properties of Nambulite

Electron Density:

r_electron=3.39 gm/cc
note: r_Nambulite=3.51 gm/cc.

Fermion Index

Fermion Index = 0.01153
Boson Index = 0.98847

Photoelectric:

PE_Nambulite= 10.09 barns/electron
U=PE_Nambulite x r_electron= 34.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nambulite is Not Radioactive

Nambulite Classification

Dana Class:

65.4.1.4 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.4)with chains P=5

(65.4.1)Rhodonite group

65.4.1.1 Rhodonite (Mn,Fe,Mg,Ca)SiO3 P1 1

65.4.1.2 Babingtonite Ca2(Fe,Mn)FeSi5O14(OH) P1 1

65.4.1.3 Manganbabingtonite Ca2(Mn,Fe)FeSi5O14(OH) P1 1

65.4.1.4 Nambulite (Li,Na)Mn4[Si5O14(OH)] P1 1

65.4.1.5 Natronambulite (Na,Li)Mn4[Si5O14(OH)] P1 1

65.4.1.6 Marsturite NaCaMn3[Si5O14(OH)] P1,P 1 Tri

65.4.1.7 Lithiomarsturite LiCa2Mn2HSi5O15 P1 1

65.4.1.8 Scandiobabingtonite! Ca2(Fe,Mn)ScSi5O14(OH) P1 1

Strunz Class:

VIII/F.27-50 VIII - Silicates

VIII/F - Inosilicates (chain and band) Five chains [Si5O15]10-

VIII/F.27 - Rhodonite - Inesite series

VIII/F.27-10 Rhodonite (Mn,Fe,Mg,Ca)SiO3 P1 1

VIII/F.27-20 Babingtonite Ca2(Fe,Mn)FeSi5O14(OH) P1 1

VIII/F.27-30 Manganbabingtonite Ca2(Mn,Fe)FeSi5O14(OH) P1 1

VIII/F.27-35 Scandiobabingtonite! Ca2(Fe,Mn)ScSi5O14(OH) P1 1

VIII/F.27-40 Santaclaraite CaMn4Si5O14(OH)2·(H2O) P1 1

VIII/F.27-50 Nambulite (Li,Na)Mn4[Si5O14(OH)] P1 1

VIII/F.27-60 Natronambulite (Na,Li)Mn4[Si5O14(OH)] P1 1

VIII/F.27-70 Lithiomarsturite LiCa2Mn2HSi5O15 P1 1

VIII/F.27-80 Marsturite NaCaMn3[Si5O14(OH)] P1,P 1 Tri

VIII/F.27-90 Inesite Ca2Mn7Si10O28(OH)2·5(H2O) P1 1

Other Nambulite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Nambulite

(Li,Na)Mn++4[Si5O14(OH)]
Dana No: 65.4.1.4 Strunz No: VIII/F.27-50
Locality:

Notes: