Gottardiite Mineral Data

General Gottardiite Information

Chemical Formula:

Na3Mg3Ca5Al19Si117O272•93(H2O)

Composition:

Molecular Weight = 10168.18 gm

Sodium 0.68 % Na 0.91 % Na₂O

Calcium 1.97 % Ca 2.76 % CaO

Magnesium 0.72 % Mg 1.19 % MgO

Aluminum 5.04 % Al 9.53 % Al₂O₃

Silicon 32.32 % Si 69.14 % SiO₂

Hydrogen 1.84 % H 16.48 % H₂O

Oxygen 57.43 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₃Mg₃Ca₅Al₁₉Si₁₁₇O₂₇₂•93(H₂O)

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Mt. Adamson, Victoria Land, Antarctica. Link to MinDat.org Location Data.

Name Origin:

Named after Professor Glauco Gottardi (1928-1988), University of Modena, in recognition of his pioneering work on the structure and crystal chemistry of natural zeolites.

Name Pronunciation:

Gottardiite + Pronunciation

Synonym:

ICSD 81390

IMA1994-054

PDF 48-1814

Gottardiite Crystallography

Axial Ratios:

a:b:c =0.5432:1:0.8987

Cell Dimensions:

a = 13.698, b = 25.213, c = 22.66, Z = 1; V = 7,826.03 Den(Calc)= 2.16

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mca

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

By Intensity(I/I_o): 11.34(1), 4.37(0.79), 4.01(0.57),

Physical Properties of Gottardiite

Cleavage:

{001} Perfect

Color:

Colorless.

Density:

2.14

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gottardiite

Gladstone-Dale:

CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2239,KPDmeas= 0.226,KC= 0.2294
Ncalc = 1.49 - 1.5

Optical Data:

Biaxial (-), a=1.48, b=1.485, g=1.486, bire=0.0060

Calculated Properties of Gottardiite

Electron Density:

Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Gottardiite =2.14 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Gottardiite= 1.69 barns/electron
U=PE_Gottardiite x rElectron Density= 3.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gottardiite is Not Radioactive

Gottardiite Classification

Dana Class:

77.01.06.08 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.06)Mordenite and related species

77.01.06.01 Mordenite (Ca,Na2,K2)Al2Si10O24•7(H2O) C mc2₁ mm2

77.01.06.02 Epistilbite CaAl2Si6O16•5(H2O) C1 1

77.01.06.03 Maricopaite Pb7Ca2(Si,Al)48O100•32(H2O) Cm2m 2/m 2/m 2/m

77.01.06.04 Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96•25(H2O) C 2/m 2/m

77.01.06.05 Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48•13(H2O) C 2/m 2/m

77.01.06.06 Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m

77.01.06.06a Ferrierite-K! (K,Na)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m

77.01.06.06b Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36•9(H2O) P 2₁/n 2/m

77.01.06.07 Boggsite NaCa2(Al5Si19O48)•17(H2O) I mma 2/m 2/m 2/m

77.01.06.08 Gottardiite! Na3Mg3Ca5Al19Si117O272•93(H2O) C mca 2/m 2/m 2/m

77.01.06.09 Terranovaite! (Na,Ca)8(Si68Al12)O160•29(H2O) C mcm 2/m 2/m 2/m

77.01.06.10 Mutinaite! Na3Ca4Si85Al11O192•60(H2O) P nma 2/m 2/m 2/m

77.01.06.12 Direnzoite! NaK6MgCa2(Al13Si47O120)•36H2O Pmmn 2/m 2/m 2/m

Strunz Class:

09.GF.10 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GF -Other Rare Zeolites

09.GF.10 Gottardiite! Na3Mg3Ca5Al19Si117O272•93(H2O) C mca 2/m 2/m 2/m

Other Gottardiite Information

References:

NAME( CanMin, v 35, p 1584) PHYS. PROP.(Eur. J. Min.,Vol.8,p687-693,1996) OPTIC PROP.(Eur. J. Min.,Vol.8,p687-693,1996)

See Also:

Links to other databases for Gottardiite :
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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Gottardiite

Na3Mg3Ca5Al19Si117O272•93(H2O)
Dana No: 77.01.06.08 Strunz No: 09.GF.10
Locality:

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