Georgechaoite Mineral Data

Georgechaoite Mineral Data +

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General Georgechaoite Information

Chemical Formula:

KNaZrSi3O9·2(H2O)

Composition:

Molecular Weight = 417.59 gm

Potassium 9.36 % K 11.28 % K₂O

Sodium 5.51 % Na 7.42 % Na₂O

Zirconium 21.85 % Zr 29.51 % ZrO₂

Silicon 20.18 % Si 43.16 % SiO₂

Hydrogen 0.97 % H 8.63 % H₂O

Oxygen 42.14 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KNaZrSi₃O₉·2(H₂O)

Environment:

Found in small cavities in an alacime nepheline syenite.

IMA Status:

Approved IMA 1985

Locality:

Wind Mountain laccolith, Otero County, New Mexico. Link to MinDat.org Location Data.

Name Origin:

The name honors Prof. George Y. Chao of Carlton University, Ottawa, Canada, for his work with Zr silicates.

Synonym:

ICSD 201843

IMA1984-024

PDF 39-315

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Georgechaoite Crystallography

Axial Ratios:

a:b:c =0.9146:1:0.5204

Cell Dimensions:

a = 11.836, b = 12.94, c = 6.735, Z = 4; V = 1,031.52 Den(Calc)= 2.69

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P 2₁nb

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

By Intensity(I/I_o): 3.12(1), 6.46(0.73), 5.95(0.7),

Crystal Structure:

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Ghose S , Thakur P , The Canadian Mineralogist , 23 (1985) p.5-10, The crystal structure of georgechaoite NaKZrSi3O9.2H2O

Physical Properties of Georgechaoite

Cleavage:

None

Color:

Colorless, White.

Density:

2.7

Diaphaniety:

Transparent

Fracture:

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

Hardness:

5 - Apatite

Streak:

white

Optical Properties of Georgechaoite

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2207,KPDmeas= 0.2199,KC= 0.2176

Optical Data:

Biaxial (-), a=1.578, b=1.597, g=1.606, bire=0.0280, 2V(Calc)=68, 2V(Meas)=67.

Calculated Properties of Georgechaoite

Electron Density:

r_electron=2.64 gm/cc
note: r_{Georgechaoite}=2.70 gm/cc.

Fermion Index

Fermion Index = 0.03414
Boson Index = 0.96586

Photoelectric:

PE_{Georgechaoite}= 30.58 barns/electron
U=PE_{Georgechaoite} x r_electron= 80.68 barns/cc.

Radioactivity:

GRapi = 131.99 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Georgechaoite - barely detectable

Georgechaoite Classification

Dana Class:

59.2.2.4 (59)Cyclosilicate Three-Membered Rings

(59.2)hydrated

(59.2.2)Catapleiite group

59.2.2.1 Catapleiite (Na,Ca,[])2ZrSi3O9·2(H2O) B2/b (pseudo-HEX) 2/m

59.2.2.2 Calcium-catapleiite (Ca,[])ZrSi3O9·2(H2O) Pbnn 2/m 2/m 2/m

59.2.2.3 Gaidonnayite Na2ZrSi3O9·2(H2O) P 2₁nb mm2

59.2.2.4 Georgechaoite KNaZrSi3O9·2(H2O) P 2₁nb mm2

59.2.2.5 Loudounite NaCa5Zr4Si16O40(OH)11·8(H2O) Mono

59.2.2.6 Bobtraillite! Na15Sr12Zr14Si42B6O138(OH)6·12(H2O) P 6₃cm 6mm

Strunz Class:

VIII/E.04-40 VIII - Silicates

VIII/E - Cyklosilicates, triplet rings [Si3O9]6-

VIII/E.04 - Catapleiite - Komkovite series

VIII/E.04-10 Catapleiite (Na,Ca,[])2ZrSi3O9·2(H2O) B2/b (pseudo-HEX) 2/m

VIII/E.04-30 Gaidonnayite Na2ZrSi3O9·2(H2O) P 2₁nb mm2

VIII/E.04-40 Georgechaoite KNaZrSi3O9·2(H2O) P 2₁nb mm2

VIII/E.04-50 Komkovite BaZrSi3O9·3(H2O) R 32 3 2

Other Georgechaoite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Georgechaoite Specimen Label here :

Georgechaoite

KNaZrSi3O9·2(H2O)
Dana No: 59.2.2.4 Strunz No: VIII/E.04-40
Locality:

Notes: