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Thorbastnäsite

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Big Photo

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
© Stephan Wolfsried

Show Thorbastnäsite Photos (3)



Formula:
Th(Ca,Ce)(CO
 
3
)
 
2
F
 
2
 · 3H
 
2
O
Colour:BrownHardness:4 - 4½
Member of:Bastnäsite Group
Name:The name reflects its thorium content and similarity to bastnäsite.


Basnäsite Group

Classification of Thorbastnäsite

IMA status:Approved
Strunz 8th edition ID:5/E.10-10
Nickel-Strunz 10th (pending) edition ID:5.BD.20a

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
D : With rare earth elements (REE)
Dana 8th edition ID:16b.1.2.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
1 : AmBn(XO3)pZqxH2O & with (m+n):p = 1:1
Hey's CIM Ref.:12.1.22

12 : Carbonates with other anions
1 : Carbonates with halides
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Type Occurrence of Thorbastnäsite

Type Locality:Pichikhol' alkaline Massif, Balygtyg-Khem River, Sangilen Upland, Tuva Republic, Eastern-Siberian Region, Russia

Physical Properties of Thorbastnäsite

Colour:Brown
Hardness (Mohs):4 - 4½

Optical Data of Thorbastnäsite

Type:Uniaxial (+)
RI values: nε = 1.670 - 1.678
Maximum Birefringence:δ = 0.000

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

Chemical Properties of Thorbastnäsite

Formula:
Th(Ca,Ce)(CO
 
3
)
 
2
F
 
2
 · 3H
 
2
O
Essential elements:C, Ca, F, H, O, Th
All elements listed in formula:C, Ca, Ce, F, H, O, Th

Relationship of Thorbastnäsite to other Species

Member of:Bastnäsite Group
Other Members of Group:

- +
Bastnäsite-(Ce)
(Ce,La)(CO
 
3
)F
Bastnäsite-(La)
(La,Ce)(CO
 
3
)F
Bastnäsite-(Nd)
Nd(CO
 
3
)F
Bastnäsite-(Y)
(Y,Ce)(CO
 
3
)F
Hydroxylbastnäsite-(Ce)
(Ce,La)(CO
 
3
)(OH,F)
Hydroxylbastnäsite-(Nd)
(Nd,Ce,La)(CO
 
3
)(OH,F)
Related Minerals - Nickel-Strunz Grouping):

- +
5.BD.05Cordylite-(Ce)
NaBaCe
 
2
(CO
 
3
)
 
4
F
5.BD.05Lukechangite-(Ce)
Na
 
3
Ce
 
2
(CO
 
3
)
 
4
F
5.BD.10Zhonghuacerite-(Ce)
Ba
 
2
Ce(CO
 
3
)
 
3
F
5.BD.10Kukharenkoite-(Ce)
Ba
 
2
Ce(CO
 
3
)
 
3
F
5.BD.10Kukharenkoite-(La)
Ba
 
2
(La,Ce,Th)(CO
 
3
)
 
3
F
5.BD.15Cebaite-(Ce)
Ba
 
3
Ce
 
2
(CO
 
3
)
 
5
F
 
2
5.BD.15Cebaite-(Nd)
Ba
 
3
(Nd,Ce)
 
2
(CO
 
3
)
 
5
F
 
2
5.BD.18Arisite-(Ce)
NaCe
 
2
(CO
 
3
)
 
3-x
F
 
2x+1
5.BD.18Arisite-(La)
NaLa
 
2
(CO
 
3
)
 
3-x
F
 
2x+1
5.BD.20aBastnäsite-(Ce)
(Ce,La)(CO
 
3
)F
5.BD.20aBastnäsite-(La)
(La,Ce)(CO
 
3
)F
5.BD.20aBastnäsite-(Y)
(Y,Ce)(CO
 
3
)F
5.BD.20aHydroxylbastnäsite-(Ce)
(Ce,La)(CO
 
3
)(OH,F)
5.BD.20aHydroxylbastnäsite-(Nd)
(Nd,Ce,La)(CO
 
3
)(OH,F)
5.BD.20aHydroxylbastnäsite-(La)
(La,Nd,Ce)(CO
 
3
)(OH,F)
5.BD.20bParisite-(Ce)
Ca(Ce,La)
 
2
(CO
 
3
)
 
3
F
 
2
5.BD.20bParisite-(Nd)
Ca(Nd,Ce,La)
 
2
(CO
 
3
)
 
3
F
 
2
5.BD.20dRöntgenite-(Ce)
Ca
 
2
(Ce,La)
 
3
(CO
 
3
)
 
5
F
 
3
5.BD.20cSynchysite-(Ce)
Ca(Ce,La)(CO
 
3
)
 
2
F
5.BD.20cSynchysite-(Nd)
Ca(Nd,Y,Gd)(CO
 
3
)
 
2
F
5.BD.20cSynchysite-(Y)
Ca(Y,Ce)(CO
 
3
)
 
2
F
5.BD.20aBastnäsite-(Nd)
Nd(CO
 
3
)F
5.BD.25Horváthite-(Y)
NaY(CO
 
3
)F
 
2
5.BD.25Qaqarssukite-(Ce)
Ba(Ce,REE)(CO
 
3
)
 
2
F
5.BD.35Huanghoite-(Ce)
BaCe(CO
 
3
)
 
2
F
Related Minerals - Hey's Index Grouping:

- +
12.1.1Northupite
Na
 
3
Mg(CO
 
3
)
 
2
Cl
12.1.2Barentsite
Na
 
7
Al(HCO
 
3
)
 
2
(CO
 
3
)
 
2
F
 
4
12.1.3Rouvilleite
Na
 
3
(Ca,Mn,Fe)
 
2
(CO
 
3
)
 
3
F
12.1.4Chlormagaluminite
Mg
 
4
Al
 
2
(OH)
 
12
Cl
 
2
 · 3H
 
2
O
12.1.5Defernite
Ca
 
6
(CO
 
3
)
 
2-x
(SiO
 
4
)
 
x
(OH)
 
7
(Cl,OH)
 
1-2x
 (x=0.5)
12.1.6Brenkite
Ca
 
2
(CO
 
3
)F
 
2
12.1.7Stenonite
(Sr,Ba,Na)
 
2
Al(CO
 
3
)F
 
5
12.1.8Bastnäsite-(Ce)
(Ce,La)(CO
 
3
)F
12.1.9Bastnäsite-(La)
(La,Ce)(CO
 
3
)F
12.1.10Bastnäsite-(Y)
(Y,Ce)(CO
 
3
)F
12.1.11Parisite-(Ce)
Ca(Ce,La)
 
2
(CO
 
3
)
 
3
F
 
2
12.1.12Parisite-(Nd)
Ca(Nd,Ce,La)
 
2
(CO
 
3
)
 
3
F
 
2
12.1.13Synchysite-(Ce)
Ca(Ce,La)(CO
 
3
)
 
2
F
12.1.14Synchysite-(Y)
Ca(Y,Ce)(CO
 
3
)
 
2
F
12.1.15Synchysite-(Nd)
Ca(Nd,Y,Gd)(CO
 
3
)
 
2
F
12.1.16Röntgenite-(Ce)
Ca
 
2
(Ce,La)
 
3
(CO
 
3
)
 
5
F
 
3
12.1.17Cordylite-(Ce)
NaBaCe
 
2
(CO
 
3
)
 
4
F
12.1.19Huanghoite-(Ce)
BaCe(CO
 
3
)
 
2
F
12.1.20Zhonghuacerite-(Ce)
Ba
 
2
Ce(CO
 
3
)
 
3
F
12.1.21Cebaite-(Ce)
Ba
 
3
Ce
 
2
(CO
 
3
)
 
5
F
 
2
12.1.23Phosgenite
Pb
 
2
CO
 
3
Cl
 
2
12.1.24Barstowite
Pb
 
4
Cl
 
6
(CO
 
3
) · H
 
2
O
12.1.25Albrechtschraufite
Ca
 
4
Mg(UO
 
2
)
 
2
(CO
 
3
)
 
6
F
 
2
 · 17H
 
2
O
12.1.26Kettnerite
CaBiCO
 
3
OF

Other Names for Thorbastnäsite

Synonyms:
Thorbastnaesite
Other Languages:
German:Thorbastnaesit
Thorbastnasit
Thorbastnesit
Spanish:Thorbastnasita
Torbastnaesita

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 Thorbastnäsite

Reference List:

- +
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1965): 94(1): 105-113.

American Mineralogist (1965): 50: 1505.

Internet Links for Thorbastnäsite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Thorbastnasite details from Handbook of Mineralogy (PDF)
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    • Localities for Thorbastnäsite

    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.
    Hide Locality List
    (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.
    Bolivia
     
    • Cochabamba Department
      • Ayopaya Province
    		Schultz, F., et al. (2004) Contrib. Mineral. Petrol., 148, 391-408.
    Brazil
     
    • Minas Gerais
      • Poços de Caldas plateau
        • Poços de Caldas
    		Baretto & Fujimori (1986)
    Canada
     
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		No reference listed
      • Montréal
    		TARASSOFF, P., HORVÁTH, L. and PFENNINGER-HORVÁTH, E. (2006) Famous mineral localities: the Francon quarry, Montréal, Québec. Mineralogical Record, 37, 5-60.
    Russia
     
    • Eastern-Siberian Region
      • Tuva Republic
        • Sangilen Upland
          • Balygtyg-Khem River
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    USA
     
    • New Mexico
      • Colfax Co.
        • Springer
          • Point of Rocks Mesa (Pecks Mesa)
    		Rocks & Min.:60:229.
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