Gjerdingenite-Na Mineral Data

General Gjerdingenite-Na Information

Chemical Formula:

(K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4•5H2O

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

Empirical Formula:

K_0.98Na_0.62Ca_0.37Ba_0.07Na_0.9Ca_0.04Mn²⁺_0.04Zn_0.02Nb_2.43Ti_1.49Fe³⁺_0.09Si_7.95Al_0.05O₂₄ (OH)_2.09O_1.91�5.32(H₂O)

Environment:

Found in peralkaline pegmatites related to agpaitic feldspathoidal syenites as an alteration product of vuonnemite. Labuntsovite group

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

De-Mix quarry, Mont Saint-Hilaire, Quebec, Canada Link to MinDat.org Location Data.

Name Origin:

Named as the Na-dominant analogue of gjerdingenite-Fe

Synonym:

IMA2005-030

Gjerdingenite-Na Image

Images:

Gjerdingenite-Na

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

Images:

Gjerdingenite-Na

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

Axial Ratios:

a:b:c =1.0329:1:0.5586

Cell Dimensions:

a = 14.626, b = 14.16, c = 7.91, Z = 2; beta = 117.43° V = 1,454.02 Den(Calc)= 2.68

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/I_o): 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

Cleavage:

None

Color:

Colorless, Pale pink.

Density:

2.71

Diaphaneity:

Transparent to Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Pseudomorphous - Occurs in the form of another mineral.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gjerdingenite-Na

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

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

Electron Density:

Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Gjerdingenite-Na =2.68 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Gjerdingenite-Na}= 33.65 barns/electron
U=PE_{Gjerdingenite-Na} x r_electron= 88.24 barns/cc.

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

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

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

References:

NAME( AmMin, v92:1776) PHYS. PROP.(AmMin, v92:1776) OPTIC PROP.(AmMin, v92:1776)

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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Gjerdingenite-Na

(K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4•5H2O
Dana No: 60.01.03e.08 Strunz No: 09.CE.30c
Locality:

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