Mineralogy Database

Trimounsite-(Y) Mineral Data

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General Trimounsite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,REE)2Ti2SiO9
Help on Composition: Composition: Molecular Weight = 475.18 gm
   La,Ce,Pr,Nd,Sm,  15.15 %  RE   17.68 % REE2O3
   Yttrium          28.06 %  Y    35.64 % Y2O3
   Titanium         21.16 %  Ti   35.30 % TiO2
   Silicon           5.32 %  Si   11.38 % SiO2
   Oxygen           30.30 %  O
                   ______        ______ 
                   100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y1.5REE0.5Ti2.1Si0.9O9
Help on Environment: Environment: In the dolomite portions of a talc deposit.
Help on IMA Status: IMA Status: Approved IMA 1990
Help on Locality: Locality: Trimouns talc deposit, 6 km northeast of Luzenac, Ariege, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality and the yttrium content.
Help on Name Pronunciation: Name Pronunciation: Trimounsite-(Y) + Pronunciation Say TRIMOUNSITE-(Y)
Help on Synonym: Synonym: IMA1989-042
 

Trimounsite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.106:1:0.4368
Help on Cell Dimensions: Cell Dimensions: a = 12.299, b = 11.12, c = 4.858, Z = 4; beta = 95.62° V = 661.21 Den(Calc)= 4.77
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.82(1), 3.44(0.9), 2.117(0.5),
 

Physical Properties of Trimounsite-(Y)

Help on Color: Color: Light brown.
Help on Density: Density: 5
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white
 

Optical Properties of Trimounsite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.106 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2306,KPDmeas= 0.22,KC= 0.246
Ncalc = 2.17 - 2.23
Help on Optical Data: Optical Data: Biaxial (-), a=2.1
 

Calculated Properties of Trimounsite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.41 gm/cc
note: Specific Gravity of Trimounsite-(Y) =4.77 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PETrimounsite-(Y) = 132.24 barns/electron
U=PETrimounsite-(Y) x relectron= 583.54 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 15,005.90 (Gamma Ray American Petroleum Institute Units)
Concentration of Trimounsite-(Y) per GRapi unit = 66.64 (PPM)

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

Estimated Radioactivity from Trimounsite-(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 / 7.37 cm 340,628 9.21E-06 15,005.90 4.93
100 gm / 3.42 cm 34,063 9.21E-07 1,500.59 0.49
10 gm / 1.59 cm 3,406 9.21E-08 150.06 0.05
1 gm / 7.37 mm 341 9.21E-09 15.01 0.00
0.1 gm / 3.42 mm 34 9.21E-10 1.50 0.00
0.01 gm / 1.59 mm 3 9.21E-11 0.15 0.00
0.001 gm / 0.74 mm 0 9.21E-12 0.02 0.00

Weight of pure Trimounsite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.77 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 ( 0.76 % Th) From Sum REE Elements (15.15 % REE)
 

Trimounsite-(Y) Classification

Help on  Dana Class: Dana Class: 52.04.08.01 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.04)with cations in [6] and/or > [6] coordination
  (52.04.08)Dana Group
 
52.04.08.01 Trimounsite-(Y) (Y,REE)2Ti2SiO9 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 09.AG.25 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AG -Nesosilicates with additional anions; cations in > [6] � [6] coordination
 
09.AG.25 Yftisite-(Y)? (Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6 C mcm 2/m 2/m 2/m
 
09.AG.25 Trimounsite-(Y) (Y,REE)2Ti2SiO9 P 21/c 2/m
 

Other Trimounsite-(Y) Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.76,p2024,1991) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Trimounsite-(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 Trimounsite-(Y) Specimen Label here :

Trimounsite-(Y)

(Y,REE)2Ti2SiO9
Dana No: 52.04.08.01 Strunz No: 09.AG.25
Locality:

 

Notes:

 

 
   
 


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