Mineralogy Database

Gjerdingenite-Fe Mineral Data

Search Webmineral :

General Gjerdingenite-Fe Information

Help on Chemical  Formula: Chemical Formula: K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]•4(H2O)
Help on Composition: Composition: Molecular Weight = 1,242.18 gm
   Potassium   6.30 %  K     7.58 % K2O
   Titanium    3.85 %  Ti    6.43 % TiO2
   Manganese   1.11 %  Mn    1.59 % Mn2O3
   Niobium    22.44 %  Nb   32.10 % Nb2O5
   Iron        3.37 %  Fe    4.82 % Fe2O3
   Silicon    18.09 %  Si   38.70 % SiO2
   Hydrogen    1.05 %  H     9.43 % H2O
   Oxygen     43.79 %  O
             ______        ______ 
             100.00 %      100.64 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2(H2O)2Fe3+0.75Mn3+0.25Nb3Ti(Si4O12)2O3(OH)�4(H2O)
Help on Environment: Environment: Found in miarolitic cavities in ekerite, a sodic granite. (labuntosovite group; structure)
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Gjerdingselva, Lunnar, Pooland, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Synonym: Synonym: IMA2001-009

Gjerdingenite-Fe Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: Brown crystals of gjerdingenite-Fe on matrix.
Location: Gjerdingen, Vestbygda, Nordmarka, Jevnaker, Oppland, Norway. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Gjerdingenite-Fe   Ralstonite

Comments: SEM photomicrograph of gjerdingenite-Fe. The mineral is dusted with tiny crystals of two phases. At high magnification, one of them is seen to form cubes and is probably ralstonite.
Location: Gjerdingselva, Lunner, Oppland, Oslo Region, Norway. Scale: Crystal length 0.5 mm.
© Canadian Mineralogist

Gjerdingenite-Fe Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.042:1:0.562
Help on Cell Dimensions: Cell Dimensions: a = 14.529, b = 13.943, c = 7.837, Z = 2; beta = 117.61° V = 1,406.81 Den(Calc)= 2.93
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): 3.225(1)(421,400,402), 6.92(0.8)(020,001), 4.94(0.7)(021), 3.114(0.67)(041,022), 2.512(0.5)(441,401,403)6.42(0.5)(200,201),

Physical Properties of Gjerdingenite-Fe

Help on Cleavage: Cleavage: None
Help on Color: Color: Pale yellow, Yellow, Yellow orange.
Help on Density: Density: 2.82
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Waxy
Help on Streak: Streak: faint yellowish white

Optical Properties of Gjerdingenite-Fe

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2459,KPDmeas= 0.2555,KC= 0.2587
Ncalc = 1.73 - 1.76
Help on Optical Data: Optical Data: Biaxial (+), a=1.6676, b=1.7001, g=1.794, bire=0.1264, 2V(Calc)=64, 2V(Meas)=58.5. Dispersion dispersion not observed.

Calculated Properties of Gjerdingenite-Fe

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Gjerdingenite-Fe =2.82 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGjerdingenite-Fe = 35.82 barns/electron
U=PEGjerdingenite-Fe x relectron= 98.51 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 88.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Gjerdingenite-Fe per GRapi unit = 1.13 (%)

Estimated Radioactivity from Gjerdingenite-Fe - barely detectable


Gjerdingenite-Fe Classification

Help on  Dana Class: Dana Class: 60.01.03e.06 (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-Fe Information

Help on References: References: NAME( CanMin, v 41, p 810) PHYS. PROP.(CanMin, v 41, p 810) OPTIC PROP.(CanMin, v 41, p 810)
Help on See Also: See Also: Links to other databases for Gjerdingenite-Fe :
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

Search for Gjerdingenite-Fe using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Gjerdingenite-Fe :

Ask about Gjerdingenite-Fe here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Gjerdingenite-Fe Specimen Label here :


Dana No: 60.01.03e.06 Strunz No: 09.CE.30c





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.