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Gaultite

Formula:
Na
 
4
Zn
 
2
Si
 
7
O
 
18
·5H
 
2
O
System:OrthorhombicColour:Colourless to pale mauve.
Lustre:VitreousHardness:6


Classification of Gaultite

IMA status:Approved
Strunz 8th edition ID:8/J.17-20
Nickel-Strunz 10th (pending) edition ID:9.GF.20

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
F : Other Rare Zeolites
Dana 8th edition ID:77.2.6.1

77 : TECTOSILICATES Zeolites
2 : Zeolite group - related species
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Type Occurrence of Gaultite

Type Locality:Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville Co., Québec, Canada
Year of Discovery:1994

Physical Properties of Gaultite

Lustre:Vitreous
Colour:Colourless to pale mauve.
Hardness (Mohs):6

Crystallography of Gaultite

Crystal System:Orthorhombic
Cell Parameters:a = 10.21Å, b = 39.88Å, c = 10.3Å
Ratio:a:b:c = 0.256 : 1 : 0.258
Unit Cell Volume:V 4,193.90 ų (Calculated from Unit Cell)

Optical Data of Gaultite

Type:Biaxial (+)
RI values: nα = 1.520 nβ = 1.521 nγ = 1.524
2V:Measured: 61° , Calculated: 62°
Maximum Birefringence:δ = 0.004

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:weak to moderate

Chemical Properties of Gaultite

Formula:
Na
 
4
Zn
 
2
Si
 
7
O
 
18
·5H
 
2
O
Essential elements:H, Na, O, Si, Zn
All elements listed in formula:H, Na, O, Si, Zn

Relationship of Gaultite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.GF.05Terranovaite
(Na,Ca)
 
8
(Si
 
68
Al
 
12
)O
 
160
·29H
 
2
O
9.GF.10Gottardiite
Na
 
3
Mg
 
3
Ca
 
5
Al
 
19
Si
 
117
O
 
272
·93H
 
2
O
9.GF.15Lovdarite
(Na,K,Ca)
 
4
(Be,Al)
 
2
Si
 
6
O
 
16
·4H
 
2
O
9.GF.25Chiavennite
CaMnBe
 
2
Si
 
5
O
 
13
(OH)
 
2
·2H
 
2
O
9.GF.30Tschernichite
(Ca,Na
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 4-8H
 
2
O
9.GF.35Mutinaite
Na
 
3
Ca
 
4
Si
 
85
Al
 
11
O
 
192
·60H
 
2
O
9.GF.40Tschörtnerite
Ca
 
4
(Ca,Sr,K,Ba)
 
3
Cu
 
3
[(OH)
 
2
|Al
 
3
Si
 
3
O
 
12
]
 
4
 · nH
 
2
O
9.GF.50Thornasite
(Na,K)Th,Si
 
11
(O,OH,F,Cl)
 
25
·8H
 
2
O
9.GF.55Direnzoite
NaK
 
6
MgCa
 
2
(Al
 
13
Si
 
47
O
 
120
)·36H
 
2
O

Other Names for Gaultite

Synonyms:
IMA1992-040
Other Languages:
German:Gaultit
Russian:Голтит
Spanish:Gaultita

Other Information

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

References for Gaultite

Reference List:New Minerals (1997), New Minerals 1990-1994.

Mineralogical Record: 27: 203.

Mineralogical Record: 30: 5-6.

Canadian Mineralogy: 32: 855-863.

Articles/Blogs about Gaultite

Internet Links for Gaultite

Search Engines:
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    • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Gaultite in the Natural History Museum (London) online catalogue
    • Mineral Dealers:
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  • Buy fine minerals and gemstones from Pala International
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    Localities for Gaultite

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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Québec
      • Rouville Co.
        • Mont Saint-Hilaire
    		Ercit, T.S. and Van Velthuizen, J. (1994), Gaultite, a new zeolite-like mineral species from Mont Saint-Hilaire, Quebec, and its crystal structure. Canadian Mineralogist: 32: 855-864.
    Mineral and/or Locality
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