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 Britholite-(Ce) Mineral Data

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
 
 
 
 
 
 
 
 
 
 
 
 
 
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) + PronunciationSay 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)

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 - DipyramidalH-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),
Click Here for Large Britholite-(Ce) Structure WindowCrystal Structure:


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Help on Above


Noe D C , Hughes J M , Mariano A N , Drexler J W , Kato A , Zeitschrift fur Kristallographie , 206 (1993) p.233-246, The crystal structure of monoclinic britholite-(Ce) and britholite-(Y), Note: unannealed sample, Locality: the Kipawa syenite gneiss complex


 

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) xelectron=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) isRadioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

EstimatedMaximum U.S. Postal Shipping Size(10 mRem/hr limit, Unshielded 10 cm box)85.76 ± 21.44 grams of pure Britholite-(Ce) .
EstimatedMaximum 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
)/hr
If Held in Hand
For One Hour




 

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
 
 
 
 
 
 
 
 
 
 
Help on Strunz Class:Strunz Class: 09.AH.2509 - SILICATES (Germanates)
 09.A - Nesosilicates
 09.AH -Nesosilicates with CO3, SO4, PO4, etc.
 
 
 
 
 
 
 
 
 

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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