Naujakasite Mineral Data

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.

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., Il?maussaq 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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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

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:

r_electron=2.67 gm/cc
note: r_Naujakasite=2.71 gm/cc.

Fermion Index

Fermion Index = 0.01229
Boson Index = 0.98771

Photoelectric:

PE_Naujakasite= 3.16 barns/electron
U=PE_Naujakasite x r_electron= 8.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Naujakasite is Not Radioactive

Naujakasite Classification

Dana Class:

73.1.1.1 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.1)with double layers

(73.1.1)Dana Group

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

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

Strunz Class:

VIII/H.29-10 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.29 - Naujakasite - Spodiophyllite series

VIII/H.29-10 Naujakasite Na6(Fe,Mn)Al4Si8O26 C 2/m 2/m

VIII/H.29-15 Manganonaujakasite! Na6(Mn,Fe)Al4Si8O26 C 2/m 2/m

VIII/H.29-20 Spodiophyllite? (Na,K)4(Mg,Fe)3(Fe,Al)2(Si8O24) Mono

Other Naujakasite Information

References:

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

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Naujakasite

Na6(Fe++,Mn)Al4Si8O26
Dana No: 73.1.1.1 Strunz No: VIII/H.29-10
Locality:

Notes: