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Britholite-(Y) Mineral Data

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General Britholite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,Ca)5(SiO4,PO4)3(OH,F)
Help on Composition: Composition: Molecular Weight = 642.79 gm
   Calcium     12.47 %  Ca   17.45 % CaO
   Yttrium     41.49 %  Y    52.69 % Y2O3
   Silicon      9.83 %  Si   21.03 % SiO2
   Phosphorus   3.61 %  P     8.28 % P2O5
   Hydrogen     0.12 %  H     1.05 % H2O
   Oxygen      31.74 %  O
   Fluorine     0.74 %  F     0.74 % F
                 -   %   F    -0.31 % -O=F2    
              ______        ______ 
              100.00 %      100.93 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y3Ca2(SiO4)2.25(PO4)0.75(OH)0.75F0.25
Help on Environment: Environment: In pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1966
Help on Locality: Locality: In the Suishoyama pegmatite, near Iisaka, Fukushima Prefecture, Japan 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 Y
Help on Name Pronunciation: Name Pronunciation: Britholite-(Y) + Pronunciation Say BRITHOLITE-(Y)
Help on Synonym: Synonym: Abukumalite
  ICSD 33858
  PDF 31-315

Britholite-(Y) Image

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Comments: Brown cm-size britholite-(Y) grains with typical prismatic 'apatite' outline in quartz matrix with black magnetite. Tengerite-(Y) forms the white encrustation in upper right part of the photo.
Location: West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 3.5x3.5 cm.
© Pavel M. Kartashov

Britholite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.72216
Help on Cell Dimensions: Cell Dimensions: a = 9.43, c = 6.81, Z = 2; V = 524.45 Den(Calc)= 4.07
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): 2.81(1), 2.75(0.9), 2.73(0.8),

Physical Properties of Britholite-(Y)

Help on Cleavage: Cleavage: {0001} Imperfect, {1010} Imperfect
Help on Color: Color: Reddish brown, Black.
Help on Density: Density: 4.25
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Resinous
Help on Streak: Streak: pale brown

Optical Properties of Britholite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.079 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1818,KPDmeas= 0.1741,KC= 0.189
Ncalc = 1.77 - 1.8
Help on Optical Data: Optical Data: Uniaxial (-), e=1.728-1.75, w=1.73-1.752, bire=0.0020.

Calculated Properties of Britholite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.86 gm/cc
note: Specific Gravity of Britholite-(Y) =4.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0049118745
Boson Index = 0.9950881255
Help on Photoelectric: Photoelectric: PEBritholite-(Y) = 53.53 barns/electron
U=PEBritholite-(Y) x rElectron Density= 206.58 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Britholite-(Y) is Not Radioactive

Britholite-(Y) Classification

Help on  Dana Class: Dana Class: (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 Ellestadite* Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 63/m 6/m Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 63/m 6/m Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 63/m 6/m Ellestadite-(F) Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 63/m 6/m Ellestadite-(OH) Ca5(SiO4,SO4)3(OH,Cl,F) P 63/m 6/m Ellestadite-(Cl) Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 63/m 6/m Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 63/m 6/m Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4•3(H2O)(?) Unk. Hex Fluorbritholite-(Ce) (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) P 63/m 6/m 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-(Y) Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Britholite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 09.AH.25





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