Gaultite (original) (raw)

A valid IMA mineral species

Formula:

Na4Zn2Si7O18 · 5H2O

Colour:

Colourless to pale mauve

Crystal System:

Orthorhombic

Name:

Named by T. Scott Ercit and Jerry Van Velthuizen in 1994 in honor of Robert A. Gault (1943-), mineralogist at the Canadian Museum of Nature.

Currently the only natural zeolite with essential zinc.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1661:8

cd3f1a6d-5019-4d95-b8a2-ade09c917645

IMA Classification of GaultiteHide

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Classification of GaultiteHide

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9.GF.20

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
F : Other Rare Zeolites

77.2.6.1

77 : TECTOSILICATES Zeolites
2 : Zeolite group - related species

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of GaultiteHide

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Colour:

Colourless to pale mauve

Cleavage:

Perfect
Perfect {101} and {010} cleavages and a poor {021} cleavage.

Density:

2.52(4) g/cm3 (Measured) 2.52 g/cm3 (Calculated)

Optical Data of GaultiteHide

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RI values:

_n_α = 1.520 _n_β = 1.521 _n_γ = 1.524

2V:

Measured: 61.3° (4), Calculated: 62°

δ = 0.004

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

weak to moderate

Pleochroism:

Non-pleochroic

Chemistry of GaultiteHide

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Mindat Formula:

Na4Zn2Si7O18 · 5H2O

Crystallography of GaultiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m _m_2 - Pyramidal

Cell Parameters:

a = 10.211(3) Å, b = 39.88(2) Å, c = 10.304(4) Å

Ratio:

a:b:c = 0.256 : 1 : 0.258

Unit Cell V:

4,195.94 ų (Calculated from Unit Cell)

Morphology:

Equant, multifaceted crystals. Forms include {010}, {110}, {110}, {021}, {151}, {l5l}. Subordinate {111}, {111}, {131}, {131}, {171}, {171} and {011}.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0005410	Gaultite	Ercit T S, Van Velthuizen J (1994) Gaultite, a new zeolite-like mineral species from Mont Saint-Hilaire, Quebec, and its crystal structure The Canadian Mineralogist 32 855-863		1994	Mont Saint-Hilaire, Quebec, Canada	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of GaultiteHide

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General Appearance of Type Material:

Euhedral, multifaceted crystals to 0.5 mm in a sodalite inclusion.

Place of Conservation of Type Material:

Canadian Museum of Nature, Ottawa, Ontario, Canada, number CMN 81513.

Geological Setting of Type Material:

Contact of hornfels and nepheline-sodalite syenite.

Associated Minerals at Type Locality:

Synonyms of GaultiteHide

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Other Language Names for GaultiteHide

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Relationship of Gaultite to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of GaultiteHide

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Bright apple-green fluorescence under short-wave UV.

Other InformationHide

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Notes:

Gaultite does not readily dissolve in 1:1 HCl but does show very slight etching after prolonged exposure.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for GaultiteHide

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References for GaultiteHide

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Localities for GaultiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.