Nambulite Mineral Data

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.

Name Pronunciation:

Nambulite + Pronunciation

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 - Pinacoidal H-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),

Physical Properties of Nambulite

Cleavage:

{001} Perfect, {100} Distinct, {010} Distinct

Color:

Reddish orange brown.

Density:

3.51

Diaphaneity:

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= 0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2016,KPDmeas= 0.2039,KC= 0.2064
Ncalc = 1.72 - 1.73

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:

Bulk Density (Electron Density)=3.39 gm/cc
note: Specific Gravity of Nambulite =3.51 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Nambulite= 10.09 barns/electron
U=PE_Nambulite x rElectron Density= 34.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nambulite is Not Radioactive

Nambulite Classification

Dana Class:

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

(65.04)with chains P=5

(65.04.01)Rhodonite group

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

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

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

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

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

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

65.04.01.07 Lithiomarsturite LiCa2Mn2HSi5O15 P1 1

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

Strunz Class:

09.DK.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DK -Inosilicates with 5-periodic single chains

09.DK.05 Babingtonite Ca2(Fe,Mn)FeSi5O14(OH) P1 1

09.DK.05 Marsturite NaCaMn3[Si5O14(OH)] P1,P 1 Tri

09.DK.05 Natronambulite (Na,Li)Mn4[Si5O14(OH)] P1 1

09.DK.05 Lithiomarsturite LiCa2Mn2HSi5O15 P1 1

09.DK.05 Manganbabingtonite Ca2(Mn,Fe)FeSi5O14(OH) P1 1

09.DK.05 Nambulite (Li,Na)Mn4[Si5O14(OH)] P1 1

09.DK.05 Rhodonite (Mn,Fe,Mg,Ca)SiO3 P1 1

09.DK.05 Scandiobabingtonite! Ca2(Fe,Mn)ScSi5O14(OH) P1 1

Other Nambulite Information

References:

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

See Also:

Links to other databases for Nambulite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Nambulite

(Li,Na)Mn++4[Si5O14(OH)]
Dana No: 65.04.01.04 Strunz No: 09.DK.05
Locality:

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