Gottardiite Mineral Data

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.

Synonym:

ICSD 81390

IMA1994-054

PDF 48-1814

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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 - DipyramidalH-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),

Crystal Structure:

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Alberti A , Vezzalini G , Galli E , Quartieri S , European Journal of Mineralogy , 8 (1996) p.69-75, The crystal structure of gottardiite, a new natural zeolite, Note: occupancies altered to match chemical formula

Physical Properties of Gottardiite

Cleavage:

[001] Perfect

Color:

Colorless.

Density:

2.14

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Gottardiite

Electron Density:

r_electron=2.17 gm/cc
note: r_Gottardiite=2.14 gm/cc.

Fermion Index

Fermion Index = 0.01611
Boson Index = 0.98389

Photoelectric:

PE_Gottardiite= 1.69 barns/electron
U=PE_Gottardiite x r_electron= 3.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gottardiite is Not Radioactive

Gottardiite Classification

Dana Class:

77.1.6.8 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.6)Mordenite and related species

77.1.6.1 Mordenite (Ca,Na2,K2)Al2Si10O24·7(H2O) C mc2₁ mm2

77.1.6.2 Epistilbite CaAl2Si6O16·5(H2O) C1 1

77.1.6.3 Maricopaite Pb7Ca2(Si,Al)48O100·32(H2O) Cm2m 2/m 2/m 2/m

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

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

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

77.1.6.6a Ferrierite-K! (K,Na)2Mg(Si,Al)18O36·9(H2O) Pnnm 2/m 2/m 2/m

77.1.6.6b Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36·9(H2O) P 2₁/n 2/m 2/m 2/m

77.1.6.7 Boggsite NaCa2(Al5Si19O48)·17(H2O) I mma 2/m 2/m 2/m

77.1.6.8 Gottardiite ! Na3Mg3Ca5Al19Si117O272·93(H2O) C mca 2/m 2/m 2/m

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

77.1.6.10 Mutinaite! Na3Ca4Si85Al11O192·60(H2O) P nma 2/m 2/m 2/m

Strunz Class:

VIII/J.22-08 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.22 - Zeolite group, Ferrierite - Laumontite series

VIII/J.22-01 Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36·9(H2O) P 2₁/n 2/m 2/m 2/m

VIII/J.22-03 Ferrierite-K! (K,Na)2Mg(Si,Al)18O36·9(H2O) Pnnm 2/m 2/m 2/m

VIII/J.22-05 Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36·9(H2O) Pnnm 2/m 2/m 2/m

VIII/J.22-06 Mutinaite! Na3Ca4Si85Al11O192·60(H2O) P nma 2/m 2/m 2/m

VIII/J.22-07 Terranovaite! (Na,Ca)8(Si68Al12)O160-29(H2O) C mcm 2/m 2/m 2/m

VIII/J.22-08 Gottardiite Na3Mg3Ca5Al19Si117O272·93(H2O) C mca 2/m 2/m 2/m

VIII/J.22-10 Boggsite NaCa2(Al5Si19O48)·17(H2O) I mma 2/m 2/m 2/m

VIII/J.22-15 Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48·13(H2O) C 2/m 2/m

VIII/J.22-20 Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96·25(H2O) C 2/m 2/m

VIII/J.22-30 Mordenite (Ca,Na2,K2)Al2Si10O24·7(H2O) C mc2₁ mm2

VIII/J.22-40 Edingtonite BaAl2Si3O10·4(H2O) P 2₁2₁2 2 2 2

VIII/J.22-50 Laumontite CaAl2Si4O12·4(H2O) C 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Gottardiite

Na3Mg3Ca5Al19Si117O272·93(H2O)
Dana No: 77.1.6.8 Strunz No: VIII/J.22-08
Locality:

Notes: