Gaultite Mineral Data

Gaultite Mineral Data +

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General Gaultite Information

Chemical Formula:

Na4Zn2Si7O18·5(H2O)

Composition:

Molecular Weight = 797.40 gm

Sodium 11.53 % Na 15.55 % Na₂O

Zinc 16.40 % Zn 20.41 % ZnO

Silicon 24.65 % Si 52.74 % SiO₂

Hydrogen 1.26 % H 11.30 % H₂O

Oxygen 46.15 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₄Zn₂Si₇O₁₈·5(H₂O)

Environment:

In a cavity in a sodalite syenite xenolith near a contact of hornfels and nepheline-sodalite syenite.

IMA Status:

Approved IMA 1994

Locality:

Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named after Robert Allan Gault (1943- ) of the Canadian Museum of Nature.

Synonym:

ICSD 79160

IMA1992-040

PDF 46-563

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Gaultite Crystallography

Axial Ratios:

a:b:c =0.256:1:0.2583

Cell Dimensions:

a = 10.211, b = 39.88, c = 10.304, Z = 8; V = 4,195.94 Den(Calc)= 2.52

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: F2dd

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

By Intensity(I/I_o): 6.35(1), 3.24(0.6), 3.167(0.4),

Crystal Structure:

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Ercit T S , Van Velthuizen J , The Canadian Mineralogist , 32 (1994) p.855-863, Gaultite, a new zeolite-like mineral species from Mont Saint-Hilaire, Quebec,, and its crystal structure, Locality: Mont Saint-Hilaire, Quebec, Canada

Physical Properties of Gaultite

Cleavage:

[101] Perfect, [010] Perfect, [021] Poor

Color:

Colorless, Pale mauve.

Density:

2.52

Diaphaniety:

Transparent

Fracture:

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

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent, Short UV=bright green.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gaultite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.207,KPDmeas= 0.207,KC= 0.2099

Optical Data:

Biaxial (+), a=1.52, b=1.521, g=1.524, bire=0.0040, 2V(Calc)=62, 2V(Meas)=61.3. Dispersion weak to moderate, r > v.

Calculated Properties of Gaultite

Electron Density:

r_electron=2.50 gm/cc
note: r_Gaultite=2.52 gm/cc.

Fermion Index

Fermion Index = 0.01846
Boson Index = 0.98154

Photoelectric:

PE_Gaultite= 9.06 barns/electron
U=PE_Gaultite x r_electron= 22.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gaultite is Not Radioactive

Gaultite Classification

Dana Class:

77.2.6.1 (77)Tectosilicate Zeolite group

(77.2)related species

(77.2.6)Dana Group

77.2.6.1 Gaultite Na4Zn2Si7O18·5(H2O) F2dd mm2

Strunz Class:

VIII/J.17-20 VIII - Silicates

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

VIII/J.17 - Lovdarite series

VIII/J.17-05 Nabesite! Na2BeSi4O10·4(H2O) P 2₁2₁2₁ 2 2 2

VIII/J.17-10 Lovdarite K2Na6Be4Si14O36·9(H2O) Pma2 mm2

VIII/J.17-20 Gaultite Na4Zn2Si7O18·5(H2O) F2dd mm2

Other Gaultite Information

References:

NAME( MinRec) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Gaultite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Gaultite

Na4Zn2Si7O18·5(H2O)
Dana No: 77.2.6.1 Strunz No: VIII/J.17-20
Locality:

Notes: