Biraite-(Ce) Mineral Data (original) (raw)

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)0.99Si1.97O6.87F0.17

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

Click Here for Larger Biraite-(Ce) Image in a New Browser Window Images:

Click Here for Larger Biraite-(Ce) Image 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 - PrismaticH-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)(

Click Here for Large Biraite-(Ce) Structure Window Crystal Structure:

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Help on Above

| | Konev A , Pasero M , Pushcharovsky D , Merlino S , Kashaev A , Suvorova L , Ushchapovskaya Z , Nartova N , Lebedeva Y , Chukanov N , European Journal of Mineralogy , 17 (2005) p.715-721, Biraite-(Ce), Ce2Fe2+(CO3)(Si2O7), a new mineral from Siberia, with a novel structure type, Locality: Biraia deposit, Irkutsk district, Siberia, Russia | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor 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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Print or Cut-and-Paste your Biraite-(Ce) Specimen Label here :

Biraite-(Ce)

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

Notes: