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Thomasclarkite-(Y)

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Formula:
(Na,Ce)(Y,REE)(HCO
 
3
)(OH)
 
3
· 4H
 
2
O
System:MonoclinicColour:Honey-yellow to white
Lustre:VitreousHardness:2 - 3
Name:Named after Thomas Henry Clark (1893-1996), McGill University, Montreal, Quebec (Canada), noted for his studies of the geology of the St. Lawrence Lowlands.
This page provides mineralogical data about Thomasclarkite-(Y).

Classification of Thomasclarkite-(Y)

IMA status:Approved 1997
Strunz 8th edition ID:5/E.08-05
Nickel-Strunz 10th (pending) edition ID:5.DC.20

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
C : With large cations
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Type Occurrence of Thomasclarkite-(Y)

Type Locality:Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Physical Properties of Thomasclarkite-(Y)

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Honey-yellow to white
Hardness (Mohs):2 - 3

Crystallography of Thomasclarkite-(Y)

Crystal System:Monoclinic

Optical Data of Thomasclarkite-(Y)

Type:Uniaxial (-)
RI values: nω = 1.540 nε = 1.400
Maximum Birefringence:δ = 0.140

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

Chemical Properties of Thomasclarkite-(Y)

Formula:
(Na,Ce)(Y,REE)(HCO
 
3
)(OH)
 
3
· 4H
 
2
O
Simplified for copy/paste:(Na,Ce)(Y,REE)(HCO3)(OH)3·4H2O
Essential elements:C, H, Na, O, Y
All elements listed in formula:C, Ce, H, Na, O, Y

Relationship of Thomasclarkite-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.DC.05Ancylite-(Ce)
SrCe(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Calcioancylite-(Ce)
(Ca,Sr)Ce(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Calcioancylite-(Nd)
Ca(Nd,La,Ce)(CO
 
3
)
 
2
(OH)
 
.
H
 
2
O
5.DC.05Gysinite-(Nd)
Pb(Nd,La)(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Ancylite-(La)
Sr(La,Ce)(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Kozoite-(Nd)
(Nd,La,Sm,Pr)(CO
 
3
)(OH)
5.DC.05Kozoite-(La)
(La,Nd)(CO
 
3
)(OH)
5.DC.10Kamphaugite-(Y)
Ca(Y,REE)(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.15Sheldrickite
NaCa
 
3
(CO
 
3
)
 
2
F
 
3
· H
 
2
O
5.DC.25Peterbaylissite
(Hg
+
2
)
 
1.5
(CO
 
3
)(OH) · 2H
 
2
O
5.DC.30Clearcreekite
(Hg
+
2
)
 
1.5
(CO
 
3
)(OH) · 2H
 
2
O
5.DC.35Niveolanite
NaBe(CO
 
3
)(OH) · 2H
 
2
O

Other Names for Thomasclarkite-(Y)

Synonyms:
IMA1997-047
Other Languages:
German:Thomasclarkit-(Y)
Russian:Томаскларкит-(Y)

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 Thomasclarkite-(Y)

Reference List:

- +
GRICE, J.D., and GAULT, R.A. (1998) Thomasclarkite (Y), a new sodium rare earth element bicarbonate mineral species from Mont Saint Hilaire, Quebec. Canadian Mineralogist, 36, 1293 1300.

Internet Links for Thomasclarkite-(Y)

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  • Raman and XRD data at RRUFF project
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  • Thomasclarkite-(Y) details from Handbook of Mineralogy (PDF)
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  • Specimens:The following Thomasclarkite-(Y) specimens are currently listed for sale on minfind.com.

    Localities for Thomasclarkite-(Y)

    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
        • La Vallée-du-Richelieu RCM
          • Mont Saint-Hilaire
    Grice, J.D. & Gault, R.A. (1998), Thomasclarkite-(Y), a new sodium-rare-earth-element bicarbonate mineral species from Mont Saint-Hilaire, Quebec. Canadian Mineralogist: 36: 1295-1301.
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