Gjerdingenite-Ca Mineral Data (original) (raw)

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+0.03Zn0.01Nb2.51Ti1.52Si7.97Al0.03O24O2.86(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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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 - PrismaticH-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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Print or Cut-and-Paste your Gjerdingenite-Ca Specimen Label here :

Gjerdingenite-Ca

K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•6H2O
Dana No: 60.01.03e.07 Strunz No: 09.CE.30c
Locality:

Notes: