Mineralogy Database

Britholite-(Ce) Mineral Data

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General Britholite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F)
Help on Composition: Composition: Molecular Weight = 762.67 gm
   Calcium     14.71 %  Ca   20.59 % CaO
   Lanthanum    7.29 %  La    8.54 % La2O3
   Cerium      16.53 %  Ce   19.37 % Ce2O3
   Thorium     18.25 %  Th   20.77 % ThO2
   Silicon      9.94 %  Si   21.27 % SiO2
   Phosphorus   2.03 %  P     4.65 % P2O5
   Hydrogen     0.11 %  H     0.94 % H2O
   Neodymium    3.78 %  Nd    4.41 % Nd2O3
   Oxygen      26.85 %  O
   Fluorine     0.50 %  F     0.50 % F
                 -   %   F    -0.21 % -O=F2    
              ______        ______ 
              100.00 %      104.44 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2.8Ce0.9Th0.6La0.4Nd0.2Si2.7P0.5O12(OH)0.8F0.2
Help on Environment: Environment: In nepheline syenites, pegmatites and contact deposits related to them.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1901
Help on Locality: Locality: Julianehaab, South Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for weight, in allusion to its density and the content of Ce.
Help on Name Pronunciation: Name Pronunciation: Britholite-(Ce) + Pronunciation Say BRITHOLITE-(CE)
Help on Synonym: Synonym: Beckelite
  Beckelite-(Ce)
  ICSD 33858
  Lessingite
  Lessingite-(Ce)
  PDF 31-892
  Pravdite
 

Britholite-(Ce) Image

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  Britholite-(Ce)

Comments: Dark gray, parallel aggregates of britholite-(Ce) crystals in matix..
Location: Rusty Gold Mine, Jamestown District, Boulder Co., Colorado, USA. Scale: See Image.
© Paul M. Schumacher

Britholite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.73001
Help on Cell Dimensions: Cell Dimensions: a = 9.63, c = 7.03, Z = 2; V = 564.60 Den(Calc)= 4.49
Help on Crystal System: 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/Io): 2.836(1), 3.48(0.8), 2.809(0.8),1.858(0.5), 3.211(0.4), 3.927(0.4), 4.116(0.4),
 

Physical Properties of Britholite-(Ce)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Greenish brown, Yellow, Resin brown, Black.
Help on Density: Density: 4.2 - 4.7, Average = 4.45
Help on Diaphaneity: Diaphaneity: Nearly opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Adamantine - Resinous
 

Optical Properties of Britholite-(Ce)

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): brown.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1759,KPDmeas= 0.1775,KC= 0.1807
Ncalc = 1.76 - 1.85
Help on Optical Data: Optical Data: Uniaxial (+/-), a=1.77, b=1.81, bire=0.0400.
 

Calculated Properties of Britholite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.05 gm/cc
note: Specific Gravity of Britholite-(Ce) =4.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBritholite-(Ce) = 564.09 barns/electron
U=PEBritholite-(Ce) x relectron=2,286.14 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 354,674.14 (Gamma Ray American Petroleum Institute Units)
Concentration of Britholite-(Ce) per GRapi unit = 2.82 (PPM)

Britholite-(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) 85.76 ± 21.44 grams of pure Britholite-(Ce) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 8575.9 ±2144.0 grams of pure Britholite-(Ce) .

Estimated Radioactivity from Britholite-(Ce) - strong
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 / 7.54 cm 8,178,079 2.21E-04 354,674.14 116.61
100 gm / 3.50 cm 817,808 2.21E-05 35,467.41 11.66
10 gm / 1.63 cm 81,781 2.21E-06 3,546.74 1.17
1 gm / 7.54 mm 8,178 2.21E-07 354.67 0.12
0.1 gm / 3.50 mm 818 2.21E-08 35.47 0.01
0.01 gm / 1.63 mm 82 2.21E-09 3.55 0.00
0.001 gm / 0.75 mm 8 2.21E-10 0.35 0.00

Weight of pure Britholite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.45 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
 

Britholite-(Ce) Classification

Help on  Dana Class: Dana Class: 52.04.09.01 (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
Help on  Strunz Class: 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 Britholite-(Ce) Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Britholite-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Uranium Minerals
17 - WWW-MINCRYST

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Print or Cut-and-Paste your Britholite-(Ce) Specimen Label here :

Britholite-(Ce)

(Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F)
Dana No: 52.04.09.01 Strunz No: 09.AH.25
Locality:

 

Notes:

 

 
   
 


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