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Gjerdingenite-Ca Mineral Data

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General Gjerdingenite-Ca Information

Help on Chemical  Formula: Chemical Formula: K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•6H2O
Help on Composition: Composition: Molecular Weight = 1,216.40 gm
   Potassium   2.99 %  K     3.60 % K2O
   Barium      0.90 %  Ba    1.01 % BaO
   Sodium      0.85 %  Na    1.15 % Na2O
   Strontium   2.95 %  Sr    3.49 % SrO
   Calcium     2.54 %  Ca    3.55 % CaO
   Titanium    5.98 %  Ti    9.98 % TiO2
   Manganese   0.63 %  Mn    0.82 % MnO
   Niobium    19.17 %  Nb   27.42 % Nb2O5
   Aluminum    0.07 %  Al    0.13 % Al2O3
   Zinc        0.05 %  Zn    0.07 % ZnO
   Iron        0.14 %  Fe    0.18 % FeO
   Silicon    18.40 %  Si   39.37 % SiO2
   Hydrogen    1.03 %  H     9.24 % H2O
   Oxygen     44.29 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.93Na0.45Sr0.41Ca0.15Ba0.08Ca0.62Mn2+0.14Fe2+0.03Zn0.01Nb2.51Ti1.52Si7.97Al0.03 O24O2.86(OH)1.14�5.67(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: Pegmatite #61, Karnasurt, Lovozero, Kola Peninsula, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Ca-dominant analogue of gjerdingenite-Fe
Help on Synonym: Synonym: IMA2005-029

Gjerdingenite-Ca Image

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Comments: Tiny brown fragment of gjerdingenite-Ca.
Location: Pegmatite No. 61, Karnasurt Mt, Lovozero Massif, Kola Peninsula, Russia. Scale: Not Given.
© Sergey Vasiliev / Systematic Mineralogy

Gjerdingenite-Ca Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0303:1:0.5555
Help on Cell Dimensions: Cell Dimensions: a = 14.6365, b = 14.2049, c = 7.8919, Z = 2; beta = 117.467° V = 1,455.85 Den(Calc)= 2.77
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): 7.1(1), 6.999(0.88), 4.985(0.78),3.167(0.46), 3.252(0.42), 6.476(0.38), 3.14(0.36),

Physical Properties of Gjerdingenite-Ca

Help on Cleavage: Cleavage: None
Help on Color: Color: White, Pale brown, Pinkish brown.
Help on Density: Density: 2.79
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-Ca

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2556,KPDmeas= 0.2538,KC= 0.2514
Ncalc = 1.7
Help on Optical Data: Optical Data: Biaxial (+), a=1.68, b=1.682, g=1.762, bire=0.0820, 2V(Calc)=20, 2V(Meas)=25. Dispersion dispersion not observed.

Calculated Properties of Gjerdingenite-Ca

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Gjerdingenite-Ca =2.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEGjerdingenite-Ca = 37.32 barns/electron
U=PEGjerdingenite-Ca x relectron= 101.49 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 42.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Gjerdingenite-Ca per GRapi unit = 2.38 (%)

Estimated Radioactivity from Gjerdingenite-Ca - barely detectable


Gjerdingenite-Ca Classification

Help on  Dana Class: Dana Class: 60.01.03e.07 (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-Ca 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-Ca :
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.07 Strunz No: 09.CE.30c





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