Fluorbritholite-(Ce) Mineral Data

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General Fluorbritholite-(Ce) Information

Chemical Formula:

(Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F)

Composition:

Molecular Weight = 769.69 gm

Strontium 0.34 % Sr 0.40 % SrO

Calcium 10.15 % Ca 14.21 % CaO

Lanthanum 13.72 % La 16.09 % La₂O₃

Cerium 25.30 % Ce 29.64 % Ce₂O₃

Praeseodymium 3.11 % Pr 3.64 % Pr₂O₃

Samarium 0.59 % Sm 0.68 % Sm₂O₃

Yttrium 1.04 % Y 1.32 % Y₂O₃

Thorium 1.51 % Th 1.72 % ThO₂

Silicon 9.78 % Si 20.92 % SiO₂

Phosphorus 1.25 % P 2.86 % P₂O₅

Neodymium 5.81 % Nd 6.78 % Nd₂O₃

Oxygen 24.99 % O

Fluorine 2.42 % F 2.42 % F

- % F -1.02 % -O=F₂

______ ______

100.00 % 99.65 % = TOTAL OXIDE

Empirical Formula:

Ca_1.95Ce_1.39La_0.76Nd_0.31Pr_0.17Y_0.09Th_0.05Sr_0.03Sm_0.03Si_2.68P_0.31O_12.02F_0.98

Environment:

In vugs in nepheline syenite, marble zenoliths, sodalite syenite zenoliths and pegmatite dikes.

IMA Status:

Approved IMA 1994

Locality:

Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

For the relationship to Britholite-Ce with the fluorine content.

Name Pronunciation:

Fluorbritholite-(Ce) + Pronunciation

Synonym:

IMA1991-027

Fluorbritholite-(Ce) Image

Images:

Fluorbritholite-(Ce)

Comments: Amorphous (metamict) grain of fluorbritholite-(Ce) on matrix.
Location: Norra Karr, Grena, Jonkoping, Sweden. Scale: Crystal size 1 cm.
© John Veevaert

Fluorbritholite-(Ce) Crystallography

Axial Ratios:

a:c = 1:0.73373

Cell Dimensions:

a = 9.517, c = 6.983, Z = 2; V = 547.74 Den(Calc)= 4.67

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6₃/m

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

By Intensity(I/I_o): 2.845(1), 1.87(0.4), 2.822(0.4),

Crystal Structure:

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Oberti R , Ottolini L , Della Ventura G , Parodi G C , American Mineralogist , 86 (2001) p.1066-1075, On the symmetry and crystal chemistry of britholite:, New structural and microanalytical data, Sample: LOS from Rouma Island, Guinea

Physical Properties of Fluorbritholite-(Ce)

Cleavage:

{001} Distinct

Color:

Yellow, Tan, Colorless, Reddish brown.

Density:

4.66

Diaphaneity:

Opaque to translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5 - Apatite

Luster:

Adamantine

Streak:

pale brown

Optical Properties of Fluorbritholite-(Ce)

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.169,KPDmeas= 0.1693,KC= 0.1672
Ncalc = 1.78

Optical Data:

Uniaxial (-), e=1.786, w=1.792, bire=0.0060.

Calculated Properties of Fluorbritholite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.24 gm/cc
note: Specific Gravity of Fluorbritholite-(Ce) =4.67 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Fluorbritholite-(Ce)}= 286.20 barns/electron
U=PE_{Fluorbritholite-(Ce)} x r_electron=1,214.60 barns/cc.

Radioactivity:

GRapi = 29,254.55 (Gamma Ray American Petroleum Institute Units)
Concentration of Fluorbritholite-(Ce) per GRapi unit = 34.18 (PPM)

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

**Estimated Radioactivity from Fluorbritholite-(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 / 7.42 cm	676,033	1.83E-05	29,254.55	9.62
100 gm / 3.45 cm	67,603	1.83E-06	2,925.46	0.96
10 gm / 1.60 cm	6,760	1.83E-07	292.55	0.10
1 gm / 7.42 mm	676	1.83E-08	29.25	0.01
0.1 gm / 3.45 mm	68	1.83E-09	2.93	0.00
0.01 gm / 1.60 mm	7	1.83E-10	0.29	0.00
0.001 gm / 0.74 mm	1	1.83E-11	0.03	0.00

Weight of pure Fluorbritholite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.67 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

Fluorbritholite-(Ce) Classification

Dana Class:

52.04.09.08 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.04)with cations in [6] and/or > [6] coordination

(52.04.09)Silicate apatites

52.04.09.00 Ellestadite* Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 6₃/m 6/m

52.04.09.01 Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

52.04.09.02 Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

52.04.09.03 Ellestadite-(F) Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 6₃/m 6/m

52.04.09.04 Ellestadite-(OH) Ca5(SiO4,SO4)3(OH,Cl,F) P 6₃/m 6/m

52.04.09.05 Ellestadite-(Cl) Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 6₃/m 6/m

52.04.09.06 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 6₃/m 6/m

52.04.09.07 Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4•3(H2O)(?) Unk. Hex

52.04.09.08 Fluorbritholite-(Ce) (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

52.04.09.09 Fluorcalciobritholite! (Ca,REE)5[(Si,P)O4]3F P 6₃/m 6/m

Strunz Class:

09.AH.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AH -Nesosilicates with CO3, SO4, PO4, etc.

09.AH.25 Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

09.AH.25 Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

09.AH.25 Ellestadite-(Cl) Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 6₃/m 6/m

09.AH.25 Fluorbritholite-(Ce) (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

09.AH.25 Ellestadite-(F) Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 6₃/m 6/m

09.AH.25 Ellestadite* Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 6₃/m 6/m

09.AH.25 Ellestadite-(OH) Ca5(SiO4,SO4)3(OH,Cl,F) P 6₃/m 6/m

09.AH.25 Fluorcalciobritholite! (Ca,REE)5[(Si,P)O4]3F P 6₃/m 6/m

Other Fluorbritholite-(Ce) Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p1013,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Fluorbritholite-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
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 Fluorbritholite-(Ce) Specimen Label here :

Fluorbritholite-(Ce)

(Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F)
Dana No: 52.04.09.08 Strunz No: 09.AH.25
Locality:

Notes: