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.

Name Pronunciation:

Georgechaoite + Pronunciation

Synonym:

ICSD 201843

IMA1984-024

PDF 39-315

Georgechaoite Image

Images:

Georgechaoite

Comments: Single tan crystal of georgechaoite.
Location: Tolbachik Volcano, Kamchatka, Russia. Scale: Crystal Size 1.2 mm.
© Diederik Visser

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

Diaphaneity:

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
Ncalc = 1.59

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:

Bulk Density (Electron Density)=2.64 gm/cc
note: Specific Gravity of Georgechaoite =2.70 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

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)
Concentration of Georgechaoite per GRapi unit = 0.76 (%)

Estimated Radioactivity from Georgechaoite - barely detectable

Georgechaoite Classification

Dana Class:

59.02.02.04 (59)Cyclosilicate Three-Membered Rings

(59.02)hydrated

(59.02.02)Catapleiite group

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

59.02.02.02 Calciocatapleiite (Ca,[])ZrSi3O9•2(H2O) Pbnn 2/m 2/m 2/m

59.02.02.03 Gaidonnayite Na2ZrSi3O9•2(H2O) P 2₁nb mm2

59.02.02.04 Georgechaoite KNaZrSi3O9•2(H2O) P 2₁nb mm2

59.02.02.05 Loudounite NaCa5Zr4Si16O40(OH)11•8(H2O) Mono

59.02.02.06 Bobtraillite! (Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12•12H2O P 3c1 3 2/m

Strunz Class:

09.DM.15 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DM -Inosilicates with 6-periodic single chains

09.DM.15 Gaidonnayite Na2ZrSi3O9•2(H2O) P 2₁nb mm2

09.DM.15 Georgechaoite KNaZrSi3O9•2(H2O) P 2₁nb mm2

Other Georgechaoite Information

References:

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

See Also:

Links to other databases for Georgechaoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Georgechaoite

KNaZrSi3O9•2(H2O)
Dana No: 59.02.02.04 Strunz No: 09.DM.15
Locality:

Notes: