Mineralogy Database

Thomasclarkite-(Y) Mineral Data

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General Thomasclarkite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Na,Ce)(Y,REE)(HCO3)(OH)3•4(H2O)
Help on Composition: Composition: Molecular Weight = 375.77 gm
   Sodium            4.89 %  Na    6.60 % Na2O
   Cerium            7.46 %  Ce    8.73 % Ce2O3
   La,Ce,Pr,Nd,Sm,  26.83 %  RE   31.30 % REE2O3
   Yttrium          11.83 %  Y    15.02 % Y2O3
   Hydrogen          3.22 %  H    28.77 % H2O
   Carbon            3.20 %  C    11.71 % CO2
   Oxygen           42.58 %  O
                   ______        ______ 
                   100.00 %      102.13 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.8Ce0.2Y0.5REE0.7(HCO3)(OH)3•4(H2O)
Help on Environment: Environment: Occurs as a late hydrothermal phase in alkaline pegmatite dikes in nepheline syenite.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Name Pronunciation: Name Pronunciation: Thomasclarkite-(Y) + Pronunciation Say THOMASCLARKITE-(Y)
Help on Synonym: Synonym: IMA1997-047
 

Thomasclarkite-(Y) Image

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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

Thomasclarkite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3499:1:0.3507
Help on Cell Dimensions: Cell Dimensions: a = 4.556, b = 13.018, c = 4.566, Z = 1; beta = 90.15° V = 270.81 Den(Calc)= 2.30
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.97(1), 3.133(0.5), 4.32(0.5),
 

Physical Properties of Thomasclarkite-(Y)

Help on Cleavage: Cleavage: {010} Perfect, {101} Parting
Help on Color: Color: White, Yellow.
Help on Density: Density: 2.3
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Pseudo Tetragonal - Crystals show a tetragonal shape.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Thomasclarkite-(Y)

Help on Gladstone-Dale: 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
Ncalc = 1.49
Help on Optical Data: Optical Data: Uniaxial (-), e=1.4, w=1.54, bire=0.1400.
 

Calculated Properties of Thomasclarkite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.21 gm/cc
note: Specific Gravity of Thomasclarkite-(Y) =2.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEThomasclarkite-(Y) = 208.57 barns/electron
U=PEThomasclarkite-(Y) x relectron= 461.12 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 35,249.13 (Gamma Ray American Petroleum Institute Units)
Concentration of Thomasclarkite-(Y) per GRapi unit = 28.37 (PPM)

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 35,249.13 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)
 

Thomasclarkite-(Y) Classification

Help on  Dana Class: Dana Class: 13.01.09.01 (13)Acid Carbonates
  (13.01)with miscellaneous formulae
  (13.01.09)Dana Group
 
13.01.09.01 Thomasclarkite-(Y)! (Na,Ce)(Y,REE)(HCO3)(OH)3•4(H2O) P 2 2
Help on  Strunz Class: Strunz Class: 05.DC.20 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DC -With large cations
 
05.DC.20 Thomasclarkite-(Y)! (Na,Ce)(Y,REE)(HCO3)(OH)3•4(H2O) P 2 2
 

Other Thomasclarkite-(Y) Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(Eur. J. Min.,Vol.10,1998) OPTIC PROP.(AmMin, v84, p1466)
Help on See Also: See Also: Links to other databases for Thomasclarkite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Thomasclarkite-(Y)

(Na,Ce)(Y,REE)(HCO3)(OH)3•4(H2O)
Dana No: 13.01.09.01 Strunz No: 05.DC.20
Locality:

 

Notes:

 

 
   
 


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