General Fluorbritholite-(Ce) Information
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Chemical Formula: |
(Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) |
Composition: |
Molecular Weight = 622.39 gm |
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Sodium 2.22 % Na 2.99 % Na2O |
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Calcium 18.03 % Ca 25.23 % CaO |
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Lanthanum 8.93 % La 10.47 % La2O3 |
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Cerium 20.26 % Ce 23.73 % Ce2O3 |
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Silicon 12.18 % Si 26.07 % SiO2 |
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Phosphorus 2.49 % P 5.70 % P2O5 |
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Hydrogen 0.03 % H 0.29 % H2O |
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Oxygen 33.42 % O |
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Fluorine 2.44 % F 2.44 % F |
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- % F -1.03 % -O=F2
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______ ______ |
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100.00 % 95.89 % = TOTAL OXIDE |
Empirical Formula: |
Ca2.8Ce0.9La0.4Na0.6(SiO4)2.7(PO4)0.5F0.8(OH)0.2 |
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 the fluorine content. |
Synonym: |
IMA1991-027 |
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Fluorbritholite-(Ce) Image |
Images:
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Fluorbritholite-(Ce)
Comments: Amorphous (metamict) grain of fluorbritholite-(Ce) on matrix.
Location: Norra Karr, Grena, Jonkoping, Sweden.
Scale: Crystal size 1 cm.
© John Veevaert |
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Fluorbritholite-(Ce) Crystallography
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Axial Ratios: |
a:c = 1:0.73373 |
Cell Dimensions: |
a = 9.517, c = 6.983, Z = 2; V = 547.74 Den(Calc)= 3.77 |
Crystal System: |
Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 63/m |
X Ray Diffraction: |
By Intensity(I/Io): 2.845(1), 1.87(0.4), 2.822(0.4), |
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Physical Properties of Fluorbritholite-(Ce)
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Cleavage: |
[001] Distinct |
Color: |
Yellow, Tan, Colorless, Reddish brown. |
Density: |
4.66 |
Diaphaniety: |
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 |
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Optical Properties of Fluorbritholite-(Ce)
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Gladstone-Dale: |
CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.195 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2093,KPDmeas= 0.1693,KC= 0.1751 |
Optical Data: |
Uniaxial (-), e=1.786, w=1.792, bire=0.0060. |
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Calculated Properties of Fluorbritholite-(Ce)
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Electron Density: |
relectron=4.41 gm/cc note: rFluorbritholite-(Ce) =4.66 gm/cc. |
Fermion Index |
Fermion Index = 0.00617 Boson Index = 0.99383 |
Photoelectric: |
PEFluorbritholite-(Ce) = 142.51 barns/electron U=PEFluorbritholite-(Ce) x relectron= 628.02 barns/cc. |
Radioactivity: |
GRapi = 29,444.14 (Gamma Ray American Petroleum Institute Units)
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 / 7.43 cm |
653,822 |
1.77E-05 |
29,444.14 |
9.68 |
| 100 gm / 3.45 cm |
65,382 |
1.77E-06 |
2,944.41 |
0.97 |
| 10 gm / 1.60 cm |
6,538 |
1.77E-07 |
294.44 |
0.10 |
| 1 gm / 7.43 mm |
654 |
1.77E-08 |
29.44 |
0.01 |
| 0.1 gm / 3.45 mm |
65 |
1.77E-09 |
2.94 |
0.00 |
| 0.01 gm / 1.60 mm |
7 |
1.77E-10 |
0.29 |
0.00 |
| 0.001 gm / 0.74 mm |
1 |
1.77E-11 |
0.03 |
0.00 |
Weight of pure Fluorbritholite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.66 gm/cc.*
Goverment Estimate of Average Annual Exposure (
360 mRem)
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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 ( 1.46 % Th) From Sum REE Elements (29.19 % REE)
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Fluorbritholite-(Ce) Classification
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Dana Class: |
52.4.9.8 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O |
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(52.4)with cations in [6] and/or > [6] coordination |
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(52.4.9)Silicate apatites |
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52.4.9.0 Ellestadite* Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 63/m 6/m |
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52.4.9.1 Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 63/m 6/m |
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52.4.9.2 Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 63/m 6/m |
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52.4.9.3 Fluorellestadite Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 63/m 6/m |
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52.4.9.4 Hydroxylellestadite Ca5(SiO4,SO4)3(OH,Cl,F) P 63/m 6/m |
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52.4.9.5 Chlorellestadite Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 63/m 6/m |
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52.4.9.6 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 63/m 6/m |
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52.4.9.7 Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4·3(H2O)(?) Unk. Hex |
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52.4.9.8 Fluorbritholite-(Ce) (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) P 63/m 6/m |
Strunz Class: |
VIII/B.27-62 VIII - Silicates |
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VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with groups [SO4]2-, [CrO4]2- and [PO4]3- |
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VIII/B.27 - Fluorellestadite - Lessingite-(Ce) series |
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VIII/B.27-10 Fluorellestadite Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 63/m 6/m |
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VIII/B.27-20 Chlorellestadite Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 63/m 6/m |
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VIII/B.27-30 Hydroxylellestadite Ca5(SiO4,SO4)3(OH,Cl,F) P 63/m 6/m |
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VIII/B.27-40 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 63/m 6/m |
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VIII/B.27-50 Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 63/m 6/m |
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VIII/B.27-60 Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 63/m 6/m |
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VIII/B.27-62 Fluorbritholite-(Ce) (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) P 63/m 6/m |
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Other Fluorbritholite-(Ce) Information
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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 -Google Images
6 -Google Scholar
7 -MinDAT
8 -MinMax(Deutsch)
9 -MinMax(English)
10 -Mineralienatlas (Deutsch)
11 -QUT Mineral Atlas
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Print or Cut-and-Paste your Fluorbritholite-(Ce) Specimen Label here :
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Fluorbritholite-(Ce)
(Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F)
Dana No: 52.4.9.8 Strunz No: VIII/B.27-62
Locality:
Notes:
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