Tschortnerite Mineral Data

General Tschortnerite Information

Chemical Formula:

Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]•x(H2O), x>=20

Composition:

Molecular Weight = 2,445.93 gm

Potassium 0.96 % K 1.16 % K₂O

Barium 1.68 % Ba 1.88 % BaO

Strontium 4.30 % Sr 5.08 % SrO

Calcium 8.03 % Ca 11.23 % CaO

Aluminum 13.24 % Al 25.01 % Al₂O₃

Copper 7.79 % Cu 8.78 % Cu₂O

Silicon 13.78 % Si 29.48 % SiO₂

Hydrogen 1.81 % H 16.20 % H₂O

Oxygen 48.41 % O

______ ______

100.00 % 98.82 % = TOTAL OXIDE

Empirical Formula:

Ca_4.9Sr_1.2K_0.6Ba_0.3Cu₃(OH)₈Si₁₂Al₁₂O₄₈ï¿½18(H₂O)

Environment:

Ca-rich xenolith in leucite tephrite lava.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Bellberg volcano near Mayen, in the Laacher See volcano area, Eifel, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after Jochen Tschortner (1941-), mineral collector and finder of the mineral.

Name Pronunciation:

Tschortnerite + Pronunciation

Synonym:

IMA1995-051

Tschortnerite Image

Images:

Tschortnerite

Comments: Scanning electron micrograph of tschortnerite. (AmMin 83:608).
Location: Ca-rich xenolith at the Bellberg volcano near Mayen, Eifel, Germany. Scale: Scale Bar 20 µm.
© American Mineralogist

Tschortnerite Crystallography

Cell Dimensions:

a = 31.62, Z = 16; V = 31,614.45 Den(Calc)= 2.06

Crystal System:

Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 18.34(1), 15.82(0.5), 9.69(0.05),

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Physical Properties of Tschortnerite

Cleavage:

None

Color:

Light blue.

Density:

2.1

Diaphaneity:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Tschortnerite

Gladstone-Dale:

CI meas= -0.07 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.091 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2447,KPDmeas= 0.24,KC= 0.2244
Ncalc = 1.46 - 1.47

Optical Data:

Isotropic, n=1.504.

Calculated Properties of Tschortnerite

Electron Density:

Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Tschortnerite =2.10 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Tschortnerite}= 16.68 barns/electron
U=PE_{Tschortnerite} x r_electron= 34.90 barns/cc.

Radioactivity:

GRapi = 13.81 (Gamma Ray American Petroleum Institute Units)
Concentration of Tschortnerite per GRapi unit = 7.24 (%)

Estimated Radioactivity from Tschortnerite - barely detectable

Tschortnerite Classification

Dana Class:

77.01.02.09 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.02)Chabazite and related species

77.01.02.01 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]•12H2O P1 1

77.01.02.01a Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

77.01.02.01b Chabazite-K! (K2,Ca,Na2,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

77.01.02.01c Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]•6(H2O) R 3m 3 2/m

77.01.02.02 Herschelite? (Na,Ca,K)AlSi2O6•3(H2O) R 3m 3 2/m

77.01.02.03 Willhendersonite KCaAl3Si3O12•5(H2O) P1 1

77.01.02.04 Offretite (K2,Ca,Mg)2.5Al5Si13O36•15(H2O) P 6m2 6 m2

77.01.02.05 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.05a Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.05b Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.06 Gmelinite-Na (Na2,Ca)Al2Si4O12•6(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.06a Gmelinite-Ca! (Ca,Na2)Al2Si4O12•6(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.06b Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)•22(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.07 Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m

77.01.02.07a Faujasite-Ca! (Ca,Na2,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m

77.01.02.07b Faujasite-Mg! (Mg,Na2,Ca)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m

77.01.02.08 Levyne-Ca (Ca,Na2,K2)Al2Si4O12•6(H2O) R 3m 3 2/m

77.01.02.08a Levyne-Na! (Na2,Ca,K2)Al2Si4O12•6(H2O) R 3m 3 2/m

77.01.02.09 Tschortnerite! Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]•x(H2O),x>=20 F m3m 4/m 3 2/m

Strunz Class:

09.GF.40 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GF -Other Rare Zeolites

09.GF.40 Tschortnerite! Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]•x(H2O),x>=20 F m3m 4/m 3 2/m

Other Tschortnerite Information

References:

NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p607-617,1998) OPTIC PROP.(AmMin)

See Also:

Links to other databases for Tschortnerite :
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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Tschortnerite

Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]•x(H2O), x>=20
Dana No: 77.01.02.09 Strunz No: 09.GF.40
Locality:

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