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Biraite-(Ce) Mineral Data

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General Biraite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: Ce2Fe++(CO3)(Si2O7)
Help on Composition: Composition: Molecular Weight = 551.07 gm
   Barium          0.25 %  Ba    0.28 % BaO
   Sodium          0.08 %  Na    0.11 % Na2O
   Calcium         0.51 %  Ca    0.71 % CaO
   Lanthanum      14.37 %  La   16.85 % La2O3
   Cerium         25.68 %  Ce   30.08 % Ce2O3
   Praeseodymium   2.30 %  Pr    2.69 % Pr2O3
   Samarium        0.55 %  Sm    0.63 % Sm2O3
   Magnesium       1.10 %  Mg    1.83 % MgO
   Titanium        0.09 %  Ti    0.14 % TiO2
   Manganese       1.10 %  Mn    1.42 % MnO
   Iron            6.08 %  Fe    7.82 % FeO
   Silicon        10.04 %  Si   21.48 % SiO2
   Carbon          2.16 %  C     7.91 % CO2
   Neodymium       6.54 %  Nd    7.63 % Nd2O3
   Oxygen         28.57 %  O
   Fluorine        0.59 %  F     0.59 % F
                    -   %   F    -0.25 % -O=F2    
                 ______        ______ 
                 100.00 %       99.93 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: La0.57Nd0.25Pr0.09Sm0.02Ca0.07Na0.02Ba0.01Fe2+0.6Mg0.25Mn2+0.11Ti0.01(CO3)0.99Si1.97 O6.87F0.17
Help on Environment: Environment: Found in one of the veins of carbonate rocks among the fenites of Biraia cabonatite dike.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Biraia, Vitim, Irkutsk Oblast, Zabaikalye, (Siberia), Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Synonym: Synonym: IMA2003-037
 

Biraite-(Ce) Image

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  Biraite-(Ce)

Comments: Brown grains of biraite-(Ce) in matrix.
Location: Biraya Fe-REE Ore occurrence, Vitim Highland, Buratie Republic, Eastern Siberia, Russia. Scale: Not Given.
© Diederik Visser

Biraite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9645:1:2.7522
Help on Cell Dimensions: Cell Dimensions: a = 6.505, b = 6.744, c = 18.561, Z = 4; beta = 108.75° V = 771.05 Den(Calc)= 4.75
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): 2.92(1)(006,212 ), 3.3(0.5)(021 ), 2.23(0.5)(116,031 ), 2.65(0.5)( 202,124 ), 4.41(0.4)(102 ), 3.61(0.4)(114 ), 3.14(0.4)(022 ), 2.67(0.3)(024 ), 4.54(0.3)(
 

Physical Properties of Biraite-(Ce)

Help on Color: Color: Brown.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Biraite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1695,KC= 0.1688
Ncalc = 1.8
Help on Optical Data: Optical Data: Biaxial (-), a=1.785, b=1.81, g=1.82, bire=0.0350, 2V(Calc)=62, 2V(Meas)=66. Dispersion r < v weak.
 

Calculated Properties of Biraite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.31 gm/cc
note: Specific Gravity of Biraite-(Ce) =4.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEBiraite-(Ce) = 256.42 barns/electron
U=PEBiraite-(Ce) x relectron=1,105.76 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 47,904.25 (Gamma Ray American Petroleum Institute Units)
Concentration of Biraite-(Ce) per GRapi unit = 20.87 (PPM)

Biraite-(Ce) 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) 634.95 ±158.74 grams of pure Biraite-(Ce) .

Estimated Radioactivity from Biraite-(Ce) - 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 / 7.38 cm 1,108,119 2.99E-05 47,904.25 15.75
100 gm / 3.43 cm 110,812 2.99E-06 4,790.42 1.57
10 gm / 1.59 cm 11,081 2.99E-07 479.04 0.16
1 gm / 7.38 mm 1,108 2.99E-08 47.90 0.02
0.1 gm / 3.43 mm 111 2.99E-09 4.79 0.00
0.01 gm / 1.59 mm 11 2.99E-10 0.48 0.00
0.001 gm / 0.74 mm 1 2.99E-11 0.05 0.00

Weight of pure Biraite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.75 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 ( 2.47 % Th) From Sum REE Elements (49.44 % REE)
 

Biraite-(Ce) Classification

Help on  Dana Class: Dana Class: 56.05.02.01 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.05)Dana Type
  (56.05.02)Dana Group
 
56.05.02.01 Biraite-(Ce)! Ce2Fe(CO3)(Si2O7) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 09.BE.90 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.90 Biraite-(Ce)! Ce2Fe(CO3)(Si2O7) P 21/c 2/m
 

Other Biraite-(Ce) Information

Help on References: References: NAME( AmMin, v91, p1201) PHYS. PROP.(AmMin, v91, p1201) OPTIC PROP.(AmMin, v91, p1201)
Help on See Also: See Also: Links to other databases for Biraite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Biraite-(Ce)

Ce2Fe++(CO3)(Si2O7)
Dana No: 56.05.02.01 Strunz No: 09.BE.90
Locality:

 

Notes:

 

 
   
 


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