Fluorcalciobritholite Mineral Data

General Fluorcalciobritholite Information

Chemical Formula:

(Ca,REE)5[(Si,P)O4]3F

Composition:

Molecular Weight = 710.23 gm

Strontium 0.25 % Sr 0.29 % SrO

Calcium 15.80 % Ca 22.11 % CaO

Lanthanum 10.56 % La 12.39 % La₂O₃

Cerium 18.35 % Ce 21.49 % Ce₂O₃

Praeseodymium 1.59 % Pr 1.86 % Pr₂O₃

Samarium 0.64 % Sm 0.74 % Sm₂O₃

Gadolinium 0.66 % Gd 0.77 % Gd₂O₃

Dysprosium 0.46 % Dy 0.53 % Dy₂O₃

Yttrium 2.25 % Y 2.86 % Y₂O₃

Erbium 0.24 % Er 0.27 % Er₂O₃

Thorium 1.31 % Th 1.49 % ThO₂

Ytterbium 0.49 % Yb 0.55 % Yb₂O₃

Manganese 0.23 % Mn 0.30 % MnO

Silicon 7.67 % Si 16.41 % SiO₂

Phosphorus 4.62 % P 10.59 % P₂O₅

Neodymium 5.28 % Nd 6.16 % Nd₂O₃

Chlorine 0.05 % Cl 0.05 % Cl

- % Cl -0.01 % -O=Cl₂

Oxygen 27.53 % O

Fluorine 2.03 % F 2.03 % F

- % F -0.86 % -O=F₂

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

Ca_2.8Ce_0.93La_0.54Nd_0.26Y_0.18Pr_0.08Sm_0.03Gd_0.03Dy_0.02Yb_0.02Er_0.01Th_0.04Mn²⁺_0.03Sr_0.02 Si_1.94P_1.06O₁₂F_0.76O_0.22Cl_0.01

Environment:

Analog of fluorbritholite-(Ce).

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Mountain Kukisvumchorr, Khibiny massif, Kola peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition and membership in the britholite group.

Synonym:

IMA2006-010

Fluorcalciobritholite Image

Images:

Fluorcalciobritholite

Comments: Reddish black fluorcalciobritholite grain from the type locality. Part of the holotype specimen.
Location: Tuliok River head, East slope, Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Grain Size 0.8 mm.
© Pavel M. Kartashov

Fluorcalciobritholite Crystallography

Axial Ratios:

a:c = 1:0.72912

Cell Dimensions:

a = 9.58, c = 6.985, Z = 2; V = 555.17 Den(Calc)= 4.25

Crystal System:

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

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

By Intensity(I/I_o): 2.85(1), 3.15(0.7), 2.78(0.6),3.51(0.45), 1.122(0.3), 1.236(0.25), 1.931(0.25), 1.965(0.25),

Physical Properties of Fluorcalciobritholite

Color:

Pale pinkish brown, Brown.

Density:

4.2

Diaphaneity:

Transparent

Fracture:

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

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Fluorcalciobritholite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1724,KPDmeas= 0.1744,KC= 0.1731
Ncalc = 1.73 - 1.74

Optical Data:

Uniaxial (-), e=1.73, w=1.735, bire=0.0050.

Calculated Properties of Fluorcalciobritholite

Electron Density:

Bulk Density (Electron Density)=3.93 gm/cc
note: Specific Gravity of Fluorcalciobritholite =4.25 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Fluorcalciobritholite}= 233.83 barns/electron
U=PE_{Fluorcalciobritholite} x r_electron= 918.42 barns/cc.

Radioactivity:

GRapi = 25,800.01 (Gamma Ray American Petroleum Institute Units)
Concentration of Fluorcalciobritholite per GRapi unit = 38.76 (PPM)

Fluorcalciobritholite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Fluorcalciobritholite** - 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 / 7.66 cm	586,268	1.58E-05	25,800.01	8.48
100 gm / 3.56 cm	58,627	1.58E-06	2,580.00	0.85
10 gm / 1.65 cm	5,863	1.58E-07	258.00	0.08
1 gm / 7.66 mm	586	1.58E-08	25.80	0.01
0.1 gm / 3.56 mm	59	1.58E-09	2.58	0.00
0.01 gm / 1.65 mm	6	1.58E-10	0.26	0.00
0.001 gm / 0.77 mm	1	1.58E-11	0.03	0.00

Weight of pure Fluorcalciobritholite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.25 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

Fluorcalciobritholite Classification

Dana Class:

52.04.09.09 (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 Fluorcalciobritholite Information

References:

NAME( AmMin, v93:252) PHYS. PROP.(AmMin, v93:252) OPTIC PROP.(AmMin, v93:252)

See Also:

Links to other databases for Fluorcalciobritholite :
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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Fluorcalciobritholite

(Ca,REE)5[(Si,P)O4]3F
Dana No: 52.04.09.09 Strunz No: 09.AH.25
Locality:

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