Tombarthite-(Y) Mineral Data (original) (raw)
General Tombarthite-(Y) Information
Chemical Formula:
Y4(Si,H4)4O12-x(OH)4+2x
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
Empirical Formula:
Y2.2REECa0.8Si2H8.2O8.1(OH)10.5
Environment:
In pegmatite dikes cutting amphibolites.
IMA Status:
Approved IMA 1968
Locality:
Hogetveit quarry, near Setesdal, Evje, and at Reiarsdal, Norway. Link to MinDat.org Location Data.
Name Origin:
Named after Thomas Fredrik Barth (1899-1971), mineralogist and petroligist, Oslo University, Oslo, Norway.
Name Pronunciation:
Tombarthite-(Y) + Pronunciation 
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Images:
Tombarthite-(Y) Crystallography
Axial Ratios:
a:b:c =0.9766:1:0.9204
Cell Dimensions:
a = 7.12, b = 7.29, c = 6.71, Z = 1; beta = 102.683° V = 339.78 Den(Calc)= 3.64
Crystal System:
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n
X Ray Diffraction:
By Intensity(I/Io): 6.55(1), 3.42(0.8), 3.23(0.7),
Physical Properties of Tombarthite-(Y)
Cleavage:
None
Color:
Brownish black.
Density:
3.51
Diaphaneity:
Translucent to opaque
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Habit:
Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Earthy (Dull)
Optical Properties of Tombarthite-(Y)
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
Optical Data:
Isotropic, n=1.639.
Calculated Properties of Tombarthite-(Y)
Electron Density:
Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Tombarthite-(Y) =3.51 gm/cc.
Fermion Index:
Fermion Index = 0.03
Boson Index = 0.97
Photoelectric:
PETombarthite-(Y) = 146.79 barns/electron
U=PETombarthite-(Y) x relectron= 496.09 barns/cc.
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
| SpecimenSizeWeight/Volume(Sphere) * | CalculatedActivityBecquerels(Bq) | CalculatedActivityCuries (Ci) | EstimatedActivityGR(api) | EstimatedExposure(mRem**)/hrIf Held in HandFor 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
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
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
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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: