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 % Na2 O
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 % H2 O
Oxygen 45.53 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na4 Ca0.75 Mn2+ 0.25 Si6 O14 (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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEKvanefjeldite = 2.68 barns/electronU=PEKvanefjeldite x r Electron 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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