Gjerdingenite-Fe Mineral Data
General Gjerdingenite-Fe Information
Chemical Formula:
K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]•4(H2O)
Composition:
Molecular Weight = 1,242.18 gm
Potassium 6.30 % K 7.58 % K2 O
Titanium 3.85 % Ti 6.43 % TiO2
Manganese 1.11 % Mn 1.59 % Mn2 O3
Niobium 22.44 % Nb 32.10 % Nb2 O5
Iron 3.37 % Fe 4.82 % Fe2 O3
Silicon 18.09 % Si 38.70 % SiO2
Hydrogen 1.05 % H 9.43 % H2 O
Oxygen 43.79 % O
______ ______
100.00 % 100.64 % = TOTAL OXIDE
Empirical Formula:
K2 (H2 O)2 Fe3+ 0.75 Mn3+ 0.25 Nb3 Ti(Si4 O12 )2 O3 (OH)�4(H2 O)
Environment:
Found in miarolitic cavities in ekerite, a sodic granite. (labuntosovite group; structure)
IMA Status:
Approved IMA 2002 (Dana # Added)
Locality:
Gjerdingselva, Lunnar, Pooland, Norway. Link to MinDat.org Location Data.
Name Origin:
Named after the locality.
Synonym:
IMA2001-009
Gjerdingenite-Fe Image
Images:
Images:
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
Axial Ratios:
a:b:c =1.042:1:0.562
Cell Dimensions:
a = 14.529, b = 13.943, c = 7.837, Z = 2; beta = 117.61° V = 1,406.81 Den(Calc)= 2.93
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io ): 3.225(1)(4 21,400,4 02), 6.92(0.8)(020,001), 4.94(0.7)(021),
3.114(0.67)(041,022), 2.512(0.5)(4 41,401,4 03)6.42(0.5)(200,2 01),
Physical Properties of Gjerdingenite-Fe
Cleavage:
None
Color:
Pale yellow, Yellow, Yellow orange.
Density:
2.82
Diaphaneity:
Translucent to transparent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
5 - Apatite
Luster:
Vitreous - Waxy
Streak:
faint yellowish white
Optical Properties of Gjerdingenite-Fe
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
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
Electron Density:
Bulk Density (Electron Density)=2.75 gm/cc note: Specific Gravity of Gjerdingenite-Fe =2.82 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEGjerdingenite-Fe = 35.82 barns/electronU=PEGjerdingenite-Fe x r electron = 98.51 barns/cc.
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
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
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
References:
NAME( CanMin, v 41, p 810) PHYS. PROP.(CanMin, v 41, p 810) OPTIC PROP.(CanMin, v 41, p 810)
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
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Gjerdingenite-Fe
K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]•4(H2O)
Dana No: 60.01.03e.06 Strunz No: 09.CE.30c
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