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Gjerdingenite-Na Mineral Data

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General Gjerdingenite-Na Information

Help on Chemical  Formula: Chemical Formula: (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4•5H2O
Help on Composition: Composition: Molecular Weight = 1,175.50 gm
   Potassium   3.26 %  K     3.93 % K2O
   Barium      0.82 %  Ba    0.91 % BaO
   Sodium      2.97 %  Na    4.01 % Na2O
   Calcium     1.40 %  Ca    1.96 % CaO
   Titanium    6.07 %  Ti   10.12 % TiO2
   Manganese   0.19 %  Mn    0.24 % MnO
   Niobium    19.21 %  Nb   27.47 % Nb2O5
   Aluminum    0.11 %  Al    0.22 % Al2O3
   Zinc        0.11 %  Zn    0.14 % ZnO
   Iron        0.43 %  Fe    0.61 % Fe2O3
   Silicon    18.99 %  Si   40.64 % SiO2
   Hydrogen    1.09 %  H     9.75 % H2O
   Oxygen     45.35 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.98Na0.62Ca0.37Ba0.07Na0.9Ca0.04Mn2+0.04Zn0.02Nb2.43Ti1.49Fe3+0.09Si7.95Al0.05O24 (OH)2.09O1.91�5.32(H2O)
Help on Environment: Environment: Found in peralkaline pegmatites related to agpaitic feldspathoidal syenites as an alteration product of vuonnemite. Labuntsovite group
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: De-Mix quarry, Mont Saint-Hilaire, Quebec, Canada Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Na-dominant analogue of gjerdingenite-Fe
Help on Synonym: Synonym: IMA2005-030

Gjerdingenite-Na Image

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Comments: Pseudomorphs of gjerdingenite-Na (Gje) after vuonnemite with eudialyte and two generations of aegirine (right part of the specimen). (CanMin, v45:529).
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Specimen Size 8 cm.
© P. Tarassoff / Canadian Mineralogist

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Comments: SEM photomicrographs of gjerdingenite-Na showing a cluster of pseudo hexagonal prismatic crystals on microcline.
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: See Image.
© Canadian Mineralogist

Gjerdingenite-Na Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0329:1:0.5586
Help on Cell Dimensions: Cell Dimensions: a = 14.626, b = 14.16, c = 7.91, Z = 2; beta = 117.43° V = 1,454.02 Den(Calc)= 2.68
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.249(1), 3.253(0.61), 7.044(0.54),4.995(0.44), 6.51(0.42), 7.102(0.29), 3.148(0.28), 3.163(0.24),

Physical Properties of Gjerdingenite-Na

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Pale pink.
Help on Density: Density: 2.71
Help on Diaphaneity: Diaphaneity: Transparent to Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Pseudomorphous - Occurs in the form of another mineral.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Gjerdingenite-Na

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2556,KPDmeas= 0.2528,KC= 0.2548
Ncalc = 1.68 - 1.69
Help on Optical Data: Optical Data: Biaxial (+), a=1.647, b=1.653, g=1.755, bire=0.1080, 2V(Calc)=30, 2V(Meas)=25. Dispersion dispersion not observed.

Calculated Properties of Gjerdingenite-Na

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Gjerdingenite-Na =2.68 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGjerdingenite-Na = 33.65 barns/electron
U=PEGjerdingenite-Na x relectron= 88.24 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 46.03 (Gamma Ray American Petroleum Institute Units)
Concentration of Gjerdingenite-Na per GRapi unit = 2.17 (%)

Estimated Radioactivity from Gjerdingenite-Na - barely detectable


Gjerdingenite-Na Classification

Help on  Dana Class: Dana Class: 60.01.03e.08 (60)Cyclosilicate Four-Membered Rings
  (60.01)as Titanosilicates
  (60.01.03e)Labuntsovite Group (Labuntsovite subgroup Monoclinic [C2/m])
60.01.03e.01 Labuntsovite-Mn! Na4K4(Ba,K)(Mn,Fe)1x(Ti,Nb)8[Si4O12]4(O,OH)8•n(H2O),n=10-12 I2/m 2/m
60.01.03e.02 Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8•10(H2O) C 2/m 2/m
60.01.03e.03 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8•10(H2O) C 2/m 2/m
60.01.03e.04 Paratsepinite-Na! (Na,Sr,K,Ca)7(Ti,Nb)8[Si4O12]4(O,OH)8•n(H2O)n~8 C 2/m 2/m
60.01.03e.05 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m
60.01.03e.06 Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]•4(H2O) C 2/m 2/m
60.01.03e.07 Gjerdingenite-Ca! K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•6H2O C 2/m 2/m
60.01.03e.08 Gjerdingenite-Na! (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4•5H2O C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.CE.30c 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),
09.CE.30c Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m
09.CE.30c Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m
09.CE.30c Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4•6-8(H2O) Cm m
09.CE.30c Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4•5(H2O) C 2/m 2/m
09.CE.30c Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]•4(H2O) C 2/m 2/m
09.CE.30c Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m
09.CE.30c Gjerdingenite-Ca! K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•6H2O C 2/m 2/m
09.CE.30c Gjerdingenite-Na! (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4•5H2O C 2/m 2/m
09.CE.30c Burovaite-Ca! (K,Na)4Ca2(Ti,Nb)8[Si4O12]4(OH,O)8•12H2O C 2/m 2/m

Other Gjerdingenite-Na Information

Help on References: References: NAME( AmMin, v92:1776) PHYS. PROP.(AmMin, v92:1776) OPTIC PROP.(AmMin, v92:1776)
Help on See Also: See Also: Links to other databases for Gjerdingenite-Na :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 60.01.03e.08 Strunz No: 09.CE.30c





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