Naujakasite Mineral Data

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General Naujakasite Information

Chemical Formula:

Na6(Fe++,Mn)Al4Si8O26

Composition:

Molecular Weight = 942.15 gm

Sodium 14.64 % Na 19.74 % Na₂O

Manganese 1.46 % Mn 1.88 % MnO

Aluminum 11.46 % Al 21.64 % Al₂O₃

Iron 4.45 % Fe 5.72 % FeO

Silicon 23.85 % Si 51.02 % SiO₂

Oxygen 44.15 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₆Fe²⁺_0.75Mn²⁺_0.25Al₄Si₈O₂₆

Environment:

Associated with arfvedsonite.

IMA Status:

Valid Species (Pre-IMA) 1933

Locality:

Naujakasik, Tunugdliarfik Fjord, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Naujakasite + Pronunciation

Synonym:

ICSD 4369

PDF 20-1113

Naujakasite Image

Images:

Naujakasite Villiaumite

Comments: Greenish-gray crystals of naujakasite with red villiaumite.
Location: Narsaq river, Kvanefjeld Mt., Ilímaussaq massif, Greenland. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Naujakasite Crystallography

Axial Ratios:

a:b:c =1.8819:1:1.3123

Cell Dimensions:

a = 15.039, b = 7.991, c = 10.487, Z = 2; beta = 113.7° V = 1,154.00 Den(Calc)= 2.71

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.99(1), 2.26(0.7), 3.56(0.7),

Forms:

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Forms: ( 1 1 1) ( 1 1 1) ( 0 0 1)

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Crystal Structure:

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Basso R , dal Negro A , Giusta A D , Ungaretti L , Gronlands Geologiske Undersogelse: Bulletin , 116 (1975) p.11-24, The crystal structure of naujakasite, a double sheet silicate, Locality: Tuperssuatsiait Bay, Illimaussaq complex, Narsaq, Greenland

Physical Properties of Naujakasite

Cleavage:

{001} Perfect, {401} Distinct, {010} Distinct

Color:

Gray, Pearl white, Silver white.

Density:

2.622

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Micaceous - Platy texture with "flexible" plates.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2-3 - Gypsum-Calcite

Luster:

Pearly

Streak:

gray white

Optical Properties of Naujakasite

Gladstone-Dale:

CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2021,KPDmeas= 0.2089,KC= 0.2029
Ncalc = 1.53 - 1.55

Optical Data:

Biaxial (-), a=1.537, b=1.55, g=1.556, bire=0.0190, 2V(Calc)=66, 2V(Meas)=52-71.

Calculated Properties of Naujakasite

Electron Density:

Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Naujakasite =2.71 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Naujakasite= 3.16 barns/electron
U=PE_Naujakasite x rElectron Density= 8.44 barns/cc.

Radioactivity:

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

Naujakasite Classification

Dana Class:

73.01.01.01 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.01)with double layers

(73.01.01)Dana Group

73.01.01.01 Naujakasite Na6(Fe,Mn)Al4Si8O26 C 2/m 2/m

73.01.01.02 Manganonaujakasite! Na6(Mn,Fe)Al4Si8O26 C 2/m 2/m

Strunz Class:

09.EG.10 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EG -Double nets with 6-membered and larger rings

09.EG.10 Naujakasite Na6(Fe,Mn)Al4Si8O26 C 2/m 2/m

09.EG.10 Manganonaujakasite! Na6(Mn,Fe)Al4Si8O26 C 2/m 2/m

Other Naujakasite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Print or Cut-and-Paste your Naujakasite Specimen Label here :

Naujakasite

Na6(Fe++,Mn)Al4Si8O26
Dana No: 73.01.01.01 Strunz No: 09.EG.10
Locality:

Notes: