Gjerdingenite-Mn Mineral Data

General Gjerdingenite-Mn Information

Chemical Formula:

(K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O)

Composition:

Molecular Weight = 2,494.47 gm

Potassium 4.81 % K 5.80 % K₂O

Barium 0.61 % Ba 0.68 % BaO

Sodium 1.07 % Na 1.44 % Na₂O

Magnesium 0.03 % Mg 0.05 % MgO

Titanium 4.20 % Ti 7.01 % TiO₂

Manganese 2.00 % Mn 2.59 % MnO

Niobium 22.05 % Nb 31.54 % Nb₂O₅

Aluminum 0.10 % Al 0.18 % Al₂O₃

Zinc 0.42 % Zn 0.52 % ZnO

Iron 1.57 % Fe 2.02 % FeO

Silicon 17.91 % Si 38.32 % SiO₂

Hydrogen 1.10 % H 9.85 % H₂O

Oxygen 44.13 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_3.07Na_1.16Ba_0.11Mn²⁺_0.91Fe²⁺_0.7Zn_0.16Mg_0.03Nb_5.92Ti_2.19Si_15.91Al_0.09O₄₈O_6.32(OH)_1.68 (H₂O)_12.8

Environment:

Miarolitic cavities of a sodic granite ('ekerite') . Mn-dominant analogue of gjerdingenite-Fe, the Ti analogue of kuzmenkoite-Mn and a dimorph of organovaite-Mn. Labuntsovite group

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Gjerdingselva, Lunner, Oppland, Oslo Region, Norway. Link to MinDat.org Location Data.

Name Origin:

Named as the Mn-dominant analogue of gjerdingenite-Fe.

Synonym:

IMA2003-015

Gjerdingenite-Mn Image

Images:

Gjerdingenite-Mn Elpidite

Comments: Golden brown crystal of gjerdingenite-Mn, in white elpidite.
Location: Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway. Scale: Crystal Size 0.02 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Gjerdingenite-Mn Crystallography

Axial Ratios:

a:b:c =1.0431:1:0.5623

Cell Dimensions:

a = 14.563, b = 13.961, c = 7.851, Z = 2; beta = 117.62° V = 1,414.32 Den(Calc)= 5.86

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): 6.96(1)(020,001), 3.22(0.9)(421,400,402), 3.1(0.8)(041,022),4.94(0.8)(021), 2.51(0.4)(441,401,403,06.4(0.2),

Physical Properties of Gjerdingenite-Mn

Cleavage:

None

Color:

Orange yellow, Brownish yellow.

Diaphaneity:

Translucent to transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Optical Properties of Gjerdingenite-Mn

Gladstone-Dale:

CI calc= 0.516 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1212,KC= 0.2505
Ncalc = 2.47

Optical Data:

Biaxial (+), a=1.67, b=1.685, g=1.775, bire=0.1050, 2V(Calc)=48, 2V(Meas)=52. Dispersion r < v weak.

Calculated Properties of Gjerdingenite-Mn

Electron Density:

Bulk Density (Electron Density)=5.71 gm/cc
note: Specific Gravity of Gjerdingenite-Mn =5.86 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Gjerdingenite-Mn}= 37.58 barns/electron
U=PE_{Gjerdingenite-Mn} x r_electron= 214.68 barns/cc.

Radioactivity:

GRapi = 67.68 (Gamma Ray American Petroleum Institute Units)
Concentration of Gjerdingenite-Mn per GRapi unit = 1.48 (%)

Estimated Radioactivity from Gjerdingenite-Mn - barely detectable

Gjerdingenite-Mn Classification

Dana Class:

60.01.03e.05 (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-Mn Information

References:

NAME( EurJMin 16:979) PHYS. PROP.(EurJMin 16:979) OPTIC PROP.(EurJMin 16:979)

See Also:

Links to other databases for Gjerdingenite-Mn :
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-Mn

(K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O)
Dana No: 60.01.03e.05 Strunz No: 09.CE.30c
Locality:

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