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About Thomasclarkite-(Y)Hide

Thomas Henry Clark
(Na,Ce)(Y,REE)(HCO3)(OH)3 · 4H2O
Honey-yellow to white
2 - 3
Crystal System:
Named in honor of Thomas Henry Clark (1893-1996), Professor of Geology, 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)Hide

Approval Year:

D : Carbonates with additional anions, with H2O
C : With large cations

Physical Properties of Thomasclarkite-(Y)Hide

Transparent, Translucent
Honey-yellow to white
2 - 3 on Mohs scale

Optical Data of Thomasclarkite-(Y)Hide

Uniaxial (-)
RI values:
nω = 1.540 nε = 1.400
Max Birefringence:
δ = 0.140
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of Thomasclarkite-(Y)Hide

(Na,Ce)(Y,REE)(HCO3)(OH)3 · 4H2O
IMA Formula:
NaY(HCO3)(OH)3 · 4H2O

Crystallography of Thomasclarkite-(Y)Hide

Crystal System:
Class (H-M):
2 - Sphenoidal
Space Group:
Cell Parameters:
a = 4.556 Å, b = 13.018 Å, c = 4.556 Å
β = 90.15°
a:b:c = 0.35 : 1 : 0.35
Unit Cell V:
270.2 ų

Type Occurrence of Thomasclarkite-(Y)Hide

Synonyms of Thomasclarkite-(Y)Hide

Other Language Names for Thomasclarkite-(Y)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Franconite13 photos of Thomasclarkite-(Y) associated with Franconite on mindat.org.
Adamsite-(Y)8 photos of Thomasclarkite-(Y) associated with Adamsite-(Y) on mindat.org.
Siderite7 photos of Thomasclarkite-(Y) associated with Siderite on mindat.org.
Zircon5 photos of Thomasclarkite-(Y) associated with Zircon on mindat.org.
Petersenite-(Ce)4 photos of Thomasclarkite-(Y) associated with Petersenite-(Ce) on mindat.org.
Albite4 photos of Thomasclarkite-(Y) associated with Albite on mindat.org.
Aegirine3 photos of Thomasclarkite-(Y) associated with Aegirine on mindat.org.
Shomiokite-(Y)2 photos of Thomasclarkite-(Y) associated with Shomiokite-(Y) on mindat.org.
Natrolite2 photos of Thomasclarkite-(Y) associated with Natrolite on mindat.org.
Rutile2 photos of Thomasclarkite-(Y) associated with Rutile on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.DC.05Ancylite-(Ce)CeSr(CO3)2(OH) · H2OOrth. mmm (2/m 2/m 2/m)
5.DC.05Calcioancylite-(Ce)(Ce,Ca,Sr)CO3(OH,H2O)Orth. mmm (2/m 2/m 2/m)
5.DC.05Calcioancylite-(Nd)Ca(Nd,La,Ce)(CO3)2(OH).H2OMon. m : Pm
5.DC.05Gysinite-(Nd)PbNd(CO3)2(OH) · H2OOrth. mmm (2/m 2/m 2/m)
5.DC.05Ancylite-(La)LaSr(CO3)2(OH) · H2OOrth. mmm (2/m 2/m 2/m)
5.DC.05Kozoite-(Nd)(Nd,La,Sm,Pr)(CO3)(OH)Orth. mmm (2/m 2/m 2/m)
5.DC.10Kamphaugite-(Y)Ca(Y,REE)(CO3)2(OH) · H2OTet. 4 2 2 : P41 21 2
5.DC.15SheldrickiteNaCa3(CO3)2F3 · H2OTrig. 3 : P32
5.DC.25Peterbaylissite(Hg+2)1.5(CO3)(OH) · 2H2OOrth.
5.DC.30Clearcreekite(Hg+2)1.5(CO3)(OH) · 2H2OMon.
5.DC.35NiveolaniteNaBe(CO3)(OH) · 2H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mcc

Other InformationHide

Health Risks:
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)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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)Hide

Localities for Thomasclarkite-(Y)Hide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
  • 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.
Mineral and/or Locality  
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