Naujakasite Mineral Data

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., IlÃmaussaq 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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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 - 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

Search for Naujakasite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Naujakasite :

A Bijoux Google Search for Naujakasite
Adam's Minerals Google Search for Naujakasite
Cape Minerals Google Search for Naujakasite
Dakota Matrix Minerals Google Search for Naujakasite
Excalibur Mineral Corp. Google Search for Naujakasite
Exceptional Minerals Google Search for Naujakasite
John Betts Fine Minerals Search for Naujakasite
McDougall Minerals Google Search for Naujakasite
Mineral News Website Link
Rock and Mineral Shows Google Search for Naujakasite
Weinrich Minerals, Inc. Google Search for Naujakasite

Ask about Naujakasite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: