General Thomasclarkite-(Y) Information
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Chemical Formula: |
(Na,Ce)(Y,REE)(HCO3)(OH)3·4(H2O) |
Composition: |
Molecular Weight = 375.77 gm |
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Sodium 4.89 % Na 6.60 % Na2O |
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Cerium 7.46 % Ce 8.73 % Ce2O3 |
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La,Ce,Pr,Nd,Sm, 26.83 % RE 31.30 % REE2O3 |
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Yttrium 11.83 % Y 15.02 % Y2O3 |
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Hydrogen 3.22 % H 28.77 % H2O |
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Carbon 3.20 % C 11.71 % CO2 |
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Oxygen 42.58 % O |
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______ ______ |
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100.00 % 102.13 % = TOTAL OXIDE |
Empirical Formula: |
Na0.8Ce0.2Y0.5REE0.7(HCO3)(OH)3·4(H2O) |
Environment: |
Occurs as a late hydrothermal phase in alkaline pegmatite dikes in nepheline syenite. |
IMA Status: |
Approved IMA 1998 (Dana # Added) |
Locality: |
Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data. |
Name Origin: |
Named after Thomas Henry Clark (1893-1996), McGill University, Montreal, Quebec, Canada, noted for his studies of the geology of the St. Lawrence Lowlands. |
Synonym: |
IMA1997-047 |
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Thomasclarkite-(Y) Image |
Images:
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Thomasclarkite-(Y)
Comments: Transparent, yellowish crystal of thomasclarkite-(Y).
Location: Mt. St. Hilaire, Quebec, Canada.
Scale: 0.75 mm.
© John Veevaert |
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Thomasclarkite-(Y) Crystallography
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Axial Ratios: |
a:b:c =0.3499:1:0.3507 |
Cell Dimensions: |
a = 4.556, b = 13.018, c = 4.566, Z = 1; beta = 90.15° V = 270.81 Den(Calc)= 2.30 |
Crystal System: |
Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2 |
X Ray Diffraction: |
By Intensity(I/Io): 12.97(1), 3.133(0.5), 4.32(0.5), |
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
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Help on Above
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Grice J D , Gault R A , The Canadian Mineralogist , 36 (1998) p.1293-1300, Thomasclarkite-(Y), a new sodium - rare-earth-element bicarbonate mineral, species from Mont Saint-Hilaire, Quebec, Note: z-coodinate for OH2 changed., Locality: Mont Saint-Hilaire, Quebec, Canada
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Physical Properties of Thomasclarkite-(Y)
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Cleavage: |
[010] Perfect, [101] Parting |
Color: |
White, Yellow. |
Density: |
2.3 |
Diaphaniety: |
Translucent to transparent |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Pseudo Tetragonal - Crystals show a tetragonal shape. |
Hardness: |
2-3 - Gypsum-Calcite |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Thomasclarkite-(Y)
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Gladstone-Dale: |
CI meas= 0.045 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2043,KPDmeas= 0.2043,KC= 0.214 |
Optical Data: |
Uniaxial (-), e=1.4, w=1.54, bire=0.1400. |
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Calculated Properties of Thomasclarkite-(Y)
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Electron Density: |
relectron=2.21 gm/cc note: rThomasclarkite-(Y) =2.30 gm/cc. |
Fermion Index |
Fermion Index = 0.05047 Boson Index = 0.94953 |
Photoelectric: |
PEThomasclarkite-(Y) = 208.57 barns/electron U=PEThomasclarkite-(Y) x relectron= 461.12 barns/cc. |
Radioactivity: |
GRapi = 35,249.12 (Gamma Ray American Petroleum Institute Units)
Thomasclarkite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 10 cm box)
862.91 ±215.73 grams of pure Thomasclarkite-(Y) .
Estimated Radioactivity from Thomasclarkite-(Y) - weak
Specimen Size Weight/Volume (Sphere) * |
Calculated Activity Bequerols (Bq) |
Calculated Activity Curies (Ci) |
Estimated Activity GR(api) |
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour |
| 1000 gm / 9.40 cm |
770,087 |
2.08E-05 |
35,249.12 |
11.59 |
| 100 gm / 4.36 cm |
77,009 |
2.08E-06 |
3,524.91 |
1.16 |
| 10 gm / 2.02 cm |
7,701 |
2.08E-07 |
352.49 |
0.12 |
| 1 gm / 9.40 mm |
770 |
2.08E-08 |
35.25 |
0.01 |
| 0.1 gm / 4.36 mm |
77 |
2.08E-09 |
3.52 |
0.00 |
| 0.01 gm / 2.02 mm |
8 |
2.08E-10 |
0.35 |
0.00 |
| 0.001 gm / 0.94 mm |
1 |
2.08E-11 |
0.04 |
0.00 |
Weight of pure Thomasclarkite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.30 gm/cc.*
Goverment Estimate of Average Annual Exposure (
360 mRem)
**
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.71 % Th) From Sum REE Elements (34.28 % REE)
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Thomasclarkite-(Y) Classification
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Dana Class: |
13.1.9.1 (13)Acid Carbonates |
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(13.1)with miscellaneous formulae |
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(13.1.9)Dana Group |
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13.1.9.1 Thomasclarkite-(Y) ! (Na,Ce)(Y,REE)(HCO3)(OH)3·4(H2O) P 2 2 |
Strunz Class: |
V/E.08-05 V - Nitrates, Carbonates and Borates |
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V/E - Water-bearing carbonates with unfamiliar anions |
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V/E.08 - Strontiodresserite - Dundasite series |
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V/E.08-05 Thomasclarkite-(Y) (Na,Ce)(Y,REE)(HCO3)(OH)3·4(H2O) P 2 2 |
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V/E.08-10 Kamphaugite-(Y) Ca(Y,REE)(CO3)2(OH)2·3(H2O) P 41212 4 2 2 |
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V/E.08-20 Calcio-ancylite-(Ce) CaCe(CO3)2(OH)·(H2O) P mmm 2/m 2/m 2/m |
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V/E.08-25 Calcio-ancylite-(Nd) CaNd(CO3)2(OH)·(H2O) Pm m |
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V/E.08-28 Ancylite-(La)! Sr(La,Ce)(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m |
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V/E.08-30 Ancylite-(Ce) SrCe(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m |
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V/E.08-40 Gysinite-(Nd) Pb(Nd,La)(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m |
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V/E.08-50 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m |
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V/E.08-60 Dresserite BaAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m |
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V/E.08-70 Hydrodresserite BaAl2(CO3)2(OH)4·3(H2O) P1 1 |
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V/E.08-80 Montroyalite Sr4Al8(CO3)3(OH,F)26·10-11(H2O) Unk. Tri |
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V/E.08-90 Dundasite PbAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m |
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V/E.08-95 Petterdite! PbCr2(CO3)2(OH)4·H2O Pbnm 2/m 2/m 2/m |
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V/E.08-100 Barstowite Pb4(CO3)Cl6·(H2O) P 21/m 2/m |
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Other Thomasclarkite-(Y) Information
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References: |
NAME( CanMin, 8/99) PHYS. PROP.(Eur. J. Min.,Vol.10,1998) OPTIC PROP.(AmMin, v84, p1466) |
See Also: |
Links to other databases for Thomasclarkite-(Y) :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 -Google Images
4 -Google Scholar
5 -Handbook of Mineralogy (UofA)
6 -MinDAT
7 -MinMax(Deutsch)
8 -MinMax(English)
9 -Mineralienatlas (Deutsch)
10 -QUT Mineral Atlas
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Print or Cut-and-Paste your Thomasclarkite-(Y) Specimen Label here :
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Thomasclarkite-(Y)
(Na,Ce)(Y,REE)(HCO3)(OH)3·4(H2O)
Dana No: 13.1.9.1 Strunz No: V/E.08-05
Locality:
Notes:
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