Thomasclarkite-(Y)
A valid IMA mineral species
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About Thomasclarkite-(Y)
Thomas Henry Clark
Formula:
(Na,Ce)(Y,REE)(HCO3)(OH)3 · 4H2O
Colour:
Honey-yellow to white
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
2.30
Crystal System:
Monoclinic
Name:
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. The suffix/modifier follows the Levinson rule, indicating that the predominant essential REE is yttrium.
This page provides mineralogical data about Thomasclarkite-(Y).
Unique Identifiers
Mindat ID:
7336
Long-form identifier:
mindat:1:1:7336:9
GUID
(UUID V4):
(UUID V4):
4a65ae21-951b-4632-bc95-172906d3c2dc
IMA Classification of Thomasclarkite-(Y)
Classification of Thomasclarkite-(Y)
5.DC.20
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
C : With large cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
C : With large cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Tcl-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Thomasclarkite-(Y)
Vitreous
Transparency:
Transparent, Translucent
Colour:
Honey-yellow to white
Streak:
White
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {010}.
Perfect on {010}.
Parting:
Parting on {101}.
Fracture:
Irregular/Uneven
Density:
2.30(2) g/cm3 (Measured) 2.34 g/cm3 (Calculated)
Optical Data of Thomasclarkite-(Y)
Type:
Uniaxial (-)
RI values:
nω = 1.540(4) nε = 1.400(2)
Max Birefringence:
δ = 0.140
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Chemistry of Thomasclarkite-(Y)
Mindat Formula:
(Na,Ce)(Y,REE)(HCO3)(OH)3 · 4H2O
Crystallography of Thomasclarkite-(Y)
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P2
Setting:
P2
Cell Parameters:
a = 4.556 Å, b = 13.018 Å, c = 4.556 Å
β = 90.15°
β = 90.15°
Ratio:
a:b:c = 0.35 : 1 : 0.35
Unit Cell V:
270.2 ų
Z:
1
Morphology:
Blocky, pseudo-tetragonal crystals. Forms observed are the pedions {010} and {010}, sphenoids {111}, {111}, {111} and {111} and the pinacoids {101} and {101}.
Twinning:
Merohedral twinning on {101} is ubiquitous.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005579 | Thomasclarkite-(Y) | Grice J D, Gault R A (1998) Thomasclarkite-(Y), a new sodium - rare-earth-element bicarbonate mineral species from Mont Saint-Hilaire, Quebec The Canadian Mineralogist 36 1293-1300 |  | 1998 | Mont Saint-Hilaire, Quebec, Canada | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.97 Å | (100) |
| 6.52 Å | (30) |
| 4.57 Å | (30) |
| 4.32 Å | (50) |
| 3.223 Å | (30) |
| 3.133 Å | (50) |
| 2.593 Å | (30) |
| 2.035 Å | (30) |
| 2.016 Å | (40) |
| 1.844 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Thomasclarkite-(Y)
General Appearance of Type Material:
Individual, well-formed, blocky, white-to-yellow crystals up to 2 mm in length.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Ontario, Canada, 81553–81555.
Associated Minerals at Type Locality:
Synonyms of Thomasclarkite-(Y)
Other Language Names for Thomasclarkite-(Y)
German:Thomasclarkit-(Y)
Russian:Томаскларкит-(Y)
Common Associates
Associated Minerals Based on Photo Data:
| 25 photos of Thomasclarkite-(Y) associated with Franconite | Na(Nb2O5)(OH) · 3H2O |
| 20 photos of Thomasclarkite-(Y) associated with Adamsite-(Y) | NaY[CO3]2 · 6H2O |
| 17 photos of Thomasclarkite-(Y) associated with Albite | Na(AlSi3O8) |
| 11 photos of Thomasclarkite-(Y) associated with Aegirine | NaFe3+Si2O6 |
| 8 photos of Thomasclarkite-(Y) associated with Siderite | FeCO3 |
| 5 photos of Thomasclarkite-(Y) associated with Petersenite-(Ce) | Na4(Ce,La,Nd)2(CO3)5 |
| 5 photos of Thomasclarkite-(Y) associated with Zircon | Zr(SiO4) |
| 5 photos of Thomasclarkite-(Y) associated with Synchysite-(Ce) | CaCe(CO3)2F |
| 4 photos of Thomasclarkite-(Y) associated with Rhodochrosite | MnCO3 |
| 3 photos of Thomasclarkite-(Y) associated with Natrolite | Na2Al2Si3O10 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 5.DC. | Calcioancylite-(La) | (LaCa)(CO3)2(OH) · H2O |
| 5.DC. | Gysinite-(La) | PbLa(CO3)2(OH) · H2O |
| 5.DC. | Gysinite-(Ce) | PbCe(CO3)2(OH)(H2O) |
| 5.DC.05 | Ancylite-(Ce) | CeSr(CO3)2(OH) · H2O |
| 5.DC.05 | Calcioancylite-(Ce) | (Ce,Ca,Sr)CO3(OH,H2O) |
| 5.DC.05 | Calcioancylite-(Nd) | Ca(Nd,La,Ce)(CO3)2(OH).H2O |
| 5.DC.05 | Gysinite-(Nd) | PbNd(CO3)2(OH) · H2O |
| 5.DC.05 | Unnamed (La-analogue of Calcioancylite-(Ce)) | (La,Ce,Nd,Ca,Sr)CO3(OH,H2O) |
| 5.DC.05 | Ancylite-(La) | LaSr(CO3)2(OH) · H2O |
| 5.DC.05 | Kozoite-(Nd) | (Nd,La,Sm,Pr)(CO3)(OH) |
| 5.DC.05 | Kozoite-(La) | (La,Nd)(CO3)(OH) |
| 5.DC.05 | Unnamed (Ce-analogue of Kozoite-(La) and -(Nd)) | (Ce,La)(CO3)(OH) |
| 5.DC.10 | Kamphaugite-(Y) | Ca(Y,REE)(CO3)2(OH) · H2O |
| 5.DC.15 | Sheldrickite | NaCa3(CO3)2F3 · H2O |
| 5.DC.25 | Peterbaylissite | [Hg2]2+3[CO3]2(OH)2 · 4H2O |
| 5.DC.30 | Clearcreekite | [Hg2]2+3[CO3]2(OH)2 · 4H2O |
| 5.DC.35 | Niveolanite | NaBe(CO3)(OH) · 2H2O |
Fluorescence of Thomasclarkite-(Y)
Not fluorescent.
Other Information
Notes:
Dissolves readily with strong effervesce in 10% HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Thomasclarkite-(Y)
mindat.org URL:
https://www.mindat.org/min-7336.html
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References for Thomasclarkite-(Y)
Localities for Thomasclarkite-(Y)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Canada (TL) | |
| Grice et al. (1998) |
Norway | |
| Husdal (2019) |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada