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Tombarthite-(Y) Mineral Data

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General Tombarthite-(Y) Information

Help on Chemical  Formula: Chemical Formula: Y4(Si,H4)4O12-x(OH)4+2x
Help on Composition: Composition: Molecular Weight = 744.26 gm
   Calcium           4.31 %  Ca    6.03 % CaO
   La,Ce,Pr,Nd,Sm,  19.35 %  RE   22.57 % REE2O3
   Yttrium          26.28 %  Y    33.37 % Y2O3
   Silicon           7.55 %  Si   16.15 % SiO2
   Hydrogen          2.53 %  H    22.63 % H2O
   Oxygen           39.98 %  O
                   ______        ______ 
                   100.00 %      100.75 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y2.2REECa0.8Si2H8.2O8.1(OH)10.5
Help on Environment: Environment: In pegmatite dikes cutting amphibolites.
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: Hogetveit quarry, near Setesdal, Evje, and at Reiarsdal, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Thomas Fredrik Barth (1899-1971), mineralogist and petroligist, Oslo University, Oslo, Norway.
Help on Name Pronunciation: Name Pronunciation: Tombarthite-(Y) + Pronunciation Say TOMBARTHITE-(Y)
 

Tombarthite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9766:1:0.9204
Help on Cell Dimensions: Cell Dimensions: a = 7.12, b = 7.29, c = 6.71, Z = 1; beta = 102.683° V = 339.78 Den(Calc)= 3.64
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.55(1), 3.42(0.8), 3.23(0.7),
 

Physical Properties of Tombarthite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish black.
Help on Density: Density: 3.51
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Earthy (Dull)
 

Optical Properties of Tombarthite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.13 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.161 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1755,KPDmeas= 0.1821,KC= 0.2093
Ncalc = 1.73 - 1.76
Help on Optical Data: Optical Data: Isotropic, n=1.639.
 

Calculated Properties of Tombarthite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Tombarthite-(Y) =3.51 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PETombarthite-(Y) = 146.79 barns/electron
U=PETombarthite-(Y) x relectron= 496.09 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 19,942.06 (Gamma Ray American Petroleum Institute Units)
Concentration of Tombarthite-(Y) per GRapi unit = 50.15 (PPM)

Tombarthite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Tombarthite-(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 / 8.16 cm 434,950 1.18E-05 19,942.06 6.56
100 gm / 3.79 cm 43,495 1.18E-06 1,994.21 0.66
10 gm / 1.76 cm 4,350 1.18E-07 199.42 0.07
1 gm / 8.16 mm 435 1.18E-08 19.94 0.01
0.1 gm / 3.79 mm 43 1.18E-09 1.99 0.00
0.01 gm / 1.76 mm 4 1.18E-10 0.20 0.00
0.001 gm / 0.82 mm 0 1.18E-11 0.02 0.00

Weight of pure Tombarthite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.51 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 ( 0.97 % Th) From Sum REE Elements (19.35 % REE)
 

Tombarthite-(Y) Classification

Help on  Dana Class: Dana Class: 51.05.03.02 (51)Nesosilicate Insular SiO4 Groups Only
  (51.05)with cations in >[6] coordination
  (51.05.03)Huttonite group
 
51.05.03.01 Huttonite ThSiO4 P 21/n 2/m
 
51.05.03.02 Tombarthite-(Y) Y4(Si,H4)4O12-x(OH)42x P 21/n 2/m
Help on  Strunz Class: Strunz Class: 09.AD.35 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AD -Nesosilicates without additional anions;
 
09.AD.35 Huttonite ThSiO4 P 21/n 2/m
 
09.AD.35 Tombarthite-(Y) Y4(Si,H4)4O12-x(OH)42x P 21/n 2/m
 

Other Tombarthite-(Y) Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Tombarthite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Tombarthite-(Y) Specimen Label here :

Tombarthite-(Y)

Y4(Si,H4)4O12-x(OH)4+2x
Dana No: 51.05.03.02 Strunz No: 09.AD.35
Locality:

 

Notes:

 

 
   
 


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