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Weloganite

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Francon quarry, Montréal, Québec, Canada
© Saul Krotki 2006

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Formula:
Sr
 
3
Na
 
2
Zr(CO
 
3
)
 
6
·3H
 
2
O
System:TriclinicColour:Light yellow, ...
Hardness:3½
Name:
Named after Sir William Edmond Logan (1798-1875), first director of the Geological Survey of Canada (1842-1870).


Donnayite Group.

Classification of Weloganite

IMA status:Approved 1967
Strunz 8th edition ID:5/D.04-30
Nickel-Strunz 10th (pending) edition ID:5.CC.05

5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)
Dana 8th edition ID:15.3.4.4

15 : HYDRATED NORMAL CARBONATES
3 : AmBn(XO3)p·xH2O, with (m+n):p = 1:1
Hey's CIM Ref.:11.9.7

11 : Carbonates
9 : Carbonates of Pb, Zr and Th
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Type Occurrence of Weloganite

Type Locality:Francon quarry, Montréal, Québec, Canada
Place of Conservation of Type Material:Canadian Geological Survey, Ottawa 17257, 61337
Year of Discovery:1968
Geological Setting of type material:Alkalic sills.
Associated Minerals at type locality:
CalciteQuartzDawsonite

Physical Properties of Weloganite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Light yellow, amber-yellow, white
Streak:white
Hardness (Mohs):3½
Cleavage:Perfect
on pseudo{0001}
Fracture:Conchoidal
Density (measured):3.20 - 3.22 g/cm3
Density (calculated):3.208 g/cm3

Crystallography of Weloganite

Crystal System:Triclinic
Class (H-M):1 - Pedial
Space Group:P1
Cell Parameters:a = 8.966Å, b = 8.98Å, c = 6.73Å
α = 102.72°, β = 116.65°, γ = 60.06°
Ratio:a:b:c = 0.998 : 1 : 0.749
Unit Cell Volume:V 419.66 ų (Calculated from Unit Cell)
Z:1
Morphology:Roughly hexagonal, tapering crystals to 10cm, massive.
Twinning:about [103] repeated at 120 degrees
Structure
  Reference
Grice J D Perrault G (1975) The crystal structure of triclinic weloganite Note: y-coordinate of Sr2 changed. Locality: St. Michel, Montreal Island, Quebec, Canada. The Canadian Mineralogist 13:209-216.

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More Crystal Structures
Click here to view more crystal structures at the American Mineralogist Crystal Structure Database
X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Weloganite

Type:Biaxial (-)
RI values: nα = 1.558 nβ = 1.646 nγ = 1.640
2V:Measured: 15°
Maximum Birefringence:δ = 0.082

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

Chemical Properties of Weloganite

Formula:
Sr
 
3
Na
 
2
Zr(CO
 
3
)
 
6
·3H
 
2
O
Essential elements:C, H, Na, O, Sr, Zr
All elements listed in formula:C, H, Na, O, Sr, Zr

Relationship of Weloganite to other Species

Member of Group:
Donnayite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
5.CC.05Donnayite-(Y)
Sr
 
3
NaCaY(CO
 
3
)
 
6
·3H
 
2
O
5.CC.05Ewaldite
Ba(Ca,Y,Na,K)(CO
 
3
)
 
2
5.CC.05Mckelveyite-(Nd)
(Ba,Sr)(Nd,Ce,La)(CO
 
3
)
 
2
·4-10H
 
2
O
5.CC.05Mckelveyite-(Y)
Ba
 
3
Na(Ca,U)Y(CO
 
3
)
 
6
·3H
 
2
O
5.CC.10Tengerite-(Y)
Y
 
2
[CO
 
3
]
 
3
 · 2-3H
 
2
O
5.CC.15Kimuraite-(Y)
Ca(Y,Nd)
 
2
[CO
 
3
]
 
4
 · 6H
 
2
O
5.CC.15Lokkaite-(Y)
Ca(Y,Gd,Nd,Dy)
 
4
[CO
 
3
]
 
7
 · 9H
 
2
O
5.CC.20Shomiokite-(Y)
Na
 
3
Y[CO
 
3
]
 
3
 · 3H
 
2
O
5.CC.25Calkinsite-(Ce)
(Ce,La)
 
2
[CO
 
3
]
 
3
 · 4H
 
2
O
5.CC.25Lanthanite-(Ce)
(Ce,La,Nd)
 
2
[CO
 
3
]
 
3
 · 8H
 
2
O
5.CC.25Lanthanite-(La)
(La,Ce)
 
2
[CO
 
3
]
 
3
 · 8H
 
2
O
5.CC.25Lanthanite-(Nd)
(Nd,La)
 
2
[CO
 
3
]
 
3
 · 8H
 
2
O
5.CC.30Adamsite-(Y)
NaY[CO
 
3
]
 
2
 · 6H
 
2
O
5.CC.35Decrespignyite-(Y)
Cu(Y,REE)
 
4
(CO
 
3
)
 
4
Cl(OH)
 
5
·2H
 
2
O
5.CC.40Galgenbergite-(Ce)
Ca(Ce,La,Nd)
 
2
[CO
 
3
]
 
4
 · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
11.9.1Cerussite
PbCO
 
3
11.9.2Hydrocerussite
Pb
 
3
(CO
 
3
)
 
2
(OH)
 
2
11.9.3Dundasite
PbAl
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · H
 
2
O
11.9.4Gysinite-(Nd)
Pb(Nd,La)[OH|(CO
 
3
)
 
2
] · H
 
2
O
11.9.5Schuilingite-(Nd)
PbCu(Nd,Gd,Sm,Y)(CO
 
3
)
 
3
(OH)·1.5H
 
2
O
11.9.6Tuliokite
Na
 
6
BaTh(CO
 
3
)
 
6
·6H
 
2
O
11.9.8Sabinaite
Na
 
4
Zr
 
2
TiO
 
4
(CO
 
3
)
 
4

Other Names for Weloganite

Synonyms:
IMA1967-042
Other Languages:
Dutch:Weloganiet
German:Weloganit
Italian:Weloganite
Russian:Велоганит
Spanish:Weloganita

Other Information

Electrical:Pyroelectric.
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 Weloganite

Reference List:Canadian Mineralogist (1968): 9: 468-477.

American Mineralogist (1969): 54: 576.

Canadian Mineralogist (1975): 13: 209-216.

Canadian Mineralogist (1978): 16: 335-340.

Internet Links for Weloganite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Weloganite in the Natural History Museum (London) online catalogue
  • Weloganite details from Handbook of Mineralogy (PDF)
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    Localities for Weloganite

    Hide Locality List
    The 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.
    (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
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		Min Rec (2006) 37: 5-60; Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
      • Montréal
    		Canadian Mineralogist (1968): 9, 468-477; Tschernich, R. (1992): Zeolites of the World, p.52
    Canadian Museum of Nature collection
    South Africa
     
    • Northwest Province
      • Western Bushveld Complex
        • Rustenburg District
          • Pilansberg Complex
    		The Canadian Mineralogist, V 42, 2004, pp. 1169-1178.
    Mineral and/or Locality
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