Biraite-(Ce) Mineral Data

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General Biraite-(Ce) Information

Chemical Formula:

Ce2Fe++(CO3)(Si2O7)

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

Empirical Formula:

La_0.57Nd_0.25Pr_0.09Sm_0.02Ca_0.07Na_0.02Ba_0.01Fe²⁺_0.6Mg_0.25Mn²⁺_0.11Ti_0.01(CO₃)_0.99Si_1.97 O_6.87F_0.17

Environment:

Found in one of the veins of carbonate rocks among the fenites of Biraia cabonatite dike.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Biraia, Vitim, Irkutsk Oblast, Zabaikalye, (Siberia), Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

IMA2003-037

Biraite-(Ce) Image

Images:

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

Axial Ratios:

a:b:c =0.9645:1:2.7522

Cell Dimensions:

a = 6.505, b = 6.744, c = 18.561, Z = 4; beta = 108.75° V = 771.05 Den(Calc)= 4.75

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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)(

Crystal Structure:

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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)

Color:

Brown.

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Biraite-(Ce)

Gladstone-Dale:

CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1695,KC= 0.1688
Ncalc = 1.8

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)

Electron Density:

Bulk Density (Electron Density)=4.31 gm/cc
note: Specific Gravity of Biraite-(Ce) =4.75 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Biraite-(Ce)= 256.42 barns/electron
U=PE_Biraite-(Ce) x r_electron=1,105.76 barns/cc.

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 Becquerels (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

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

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

References:

NAME( AmMin, v91, p1201) PHYS. PROP.(AmMin, v91, p1201) OPTIC PROP.(AmMin, v91, p1201)

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: