Britholite-(Y) Mineral Data

Britholite-(Y) Mineral Data +

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General Britholite-(Y) Information

Chemical Formula:

(Y,Ca)5(SiO4,PO4)3(OH,F)

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

Empirical Formula:

Y₃Ca₂(SiO₄)_2.25(PO₄)_0.75(OH)_0.75F_0.25

Environment:

In pegmatites.

IMA Status:

Approved IMA 1966

Locality:

In the Suishoyama pegmatite, near Iisaka, Fukushima Prefecture, Japan Link to MinDat.org Location Data.

Name Origin:

From the Greek for weight, in allusion to its density and the content of Y

Synonym:

Abukumalite

ICSD 33858

PDF 31-315

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Britholite-(Y) Crystallography

Axial Ratios:

a:c = 1:0.72216

Cell Dimensions:

a = 9.43, c = 6.81, Z = 2; V = 524.45 Den(Calc)= 4.07

Crystal System:

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

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

By Intensity(I/I_o): 2.81(1), 2.75(0.9), 2.73(0.8),

Crystal Structure:

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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: Suishoyama, Japan

View Additional jPOWD Structure files for Britholite-(Y)
[1]

Physical Properties of Britholite-(Y)

Cleavage:

[0001] Imperfect, [1010] Imperfect

Color:

Reddish brown, Black.

Density:

4.25

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

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

Hardness:

5 - Apatite

Luster:

Resinous

Streak:

pale brown

Optical Properties of Britholite-(Y)

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

Optical Data:

Uniaxial (-), e=1.728-1.75, w=1.73-1.752, bire=0.0020.

Calculated Properties of Britholite-(Y)

Electron Density:

r_electron=3.86 gm/cc
note: r_{Britholite-(Y)}=4.07 gm/cc.

Fermion Index

Fermion Index = 0.00491
Boson Index = 0.99509

Photoelectric:

PE_{Britholite-(Y)}= 53.53 barns/electron
U=PE_{Britholite-(Y)} x r_electron= 206.58 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Britholite-(Y) is Not Radioactive

Britholite-(Y) Classification

Dana Class:

52.4.9.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.9)Silicate apatites

52.4.9.0 Ellestadite* Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 6₃/m 6/m

52.4.9.1 Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

52.4.9.2 Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

52.4.9.3 Fluorellestadite Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 6₃/m 6/m

52.4.9.4 Hydroxylellestadite Ca5(SiO4,SO4)3(OH,Cl,F) P 6₃/m 6/m

52.4.9.5 Chlorellestadite Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 6₃/m 6/m

52.4.9.6 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 6₃/m 6/m

52.4.9.7 Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4·3(H2O)(?) Unk. Hex

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.27-50 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with groups [SO4]2-, [CrO4]2- and [PO4]3-

VIII/B.27 - Fluorellestadite - Lessingite-(Ce) series

VIII/B.27-10 Fluorellestadite Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 6₃/m 6/m

VIII/B.27-20 Chlorellestadite Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 6₃/m 6/m

VIII/B.27-30 Hydroxylellestadite Ca5(SiO4,SO4)3(OH,Cl,F) P 6₃/m 6/m

VIII/B.27-40 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 6₃/m 6/m

VIII/B.27-50 Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

VIII/B.27-60 Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

VIII/B.27-62 Fluorbritholite-(Ce) (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

Other Britholite-(Y) Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Britholite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Britholite-(Y)

(Y,Ca)5(SiO4,PO4)3(OH,F)
Dana No: 52.4.9.2 Strunz No: VIII/B.27-50
Locality:

Notes: