Kvanefjeldite Mineral Data

General Kvanefjeldite Information

Chemical Formula:

Na4(Ca,Mn)Si6O14(OH)2

Composition:

Molecular Weight = 562.27 gm

Sodium 16.35 % Na 22.05 % Na₂O

Calcium 5.35 % Ca 7.48 % CaO

Manganese 2.44 % Mn 3.15 % MnO

Silicon 29.97 % Si 64.12 % SiO₂

Hydrogen 0.36 % H 3.20 % H₂O

Oxygen 45.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₄Ca_0.75Mn²⁺_0.25Si₆O₁₄(OH)₂

Environment:

As patches, streaks, and veinlets cutting arfvedsonite-bearing nepheline syenite; probably of late-stage hydrothermal origin.

IMA Status:

Approved IMA 1984

Locality:

On the Kvanefjeld Plateau, in the Ilimaussaq intrusion, southern Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality, which is Danish for the mountain where the angelica grows.

Name Pronunciation:

Kvanefjeldite + Pronunciation

Synonym:

ICSD 31260

PDF 37-4330

Kvanefjeldite Crystallography

Axial Ratios:

a:b:c =0.6432:1:0.5704

Cell Dimensions:

a = 10.213, b = 15.878, c = 9.058, Z = 4; V = 1,468.86 Den(Calc)= 2.54

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcab

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

By Intensity(I/I_o): 3.12(1), 3.88(0.7), 4.36(0.7),

Physical Properties of Kvanefjeldite

Cleavage:

{010} Good, {101} Indistinct

Color:

Violet pink.

Density:

2.55

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kvanefjeldite

Gladstone-Dale:

CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2083,KPDmeas= 0.2075,KC= 0.2081
Ncalc = 1.53

Optical Data:

Biaxial (+), a=1.522, b=1.522, g=1.543, bire=0.0210, 2V(Calc)=0, 2V(Meas)=0-9.

Calculated Properties of Kvanefjeldite

Electron Density:

Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Kvanefjeldite =2.54 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Kvanefjeldite}= 2.68 barns/electron
U=PE_{Kvanefjeldite} x rElectron Density= 6.77 barns/cc.

Radioactivity:

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

Kvanefjeldite Classification

Dana Class:

72.05.03.01 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.05)with corrugated and complex layers

(72.05.03)Dana Group

72.05.03.01 Kvanefjeldite Na4(Ca,Mn)Si6O14(OH)2 Pcab 2/m 2/m 2/m

Strunz Class:

09.DP.30 09 - SILICATES (Germanates)

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

09.DP -Transitional ino-phyllosilicate structures

09.DP.30 Kvanefjeldite Na4(Ca,Mn)Si6O14(OH)2 Pcab 2/m 2/m 2/m

Other Kvanefjeldite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Kvanefjeldite :
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

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Kvanefjeldite

Na4(Ca,Mn)Si6O14(OH)2
Dana No: 72.05.03.01 Strunz No: 09.DP.30
Locality:

Notes:

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