Fluorellestadite Mineral Data

Fluorellestadite Mineral Data +

General Fluorellestadite Information

Chemical Formula:

Ca5(SiO4,PO4,SO4)3(F,OH,Cl)

Composition:

Molecular Weight = 503.55 gm

Calcium 39.80 % Ca 55.68 % CaO

Silicon 5.58 % Si 11.93 % SiO₂

Phosphorus 6.15 % P 14.09 % P₂O₅

Hydrogen 0.06 % H 0.54 % H₂O

Sulfur 6.37 % S 15.90 % SO₃

Chlorine 0.70 % Cl 0.70 % Cl

- % Cl -0.16 % -O=Cl₂

Oxygen 39.08 % O

Fluorine 2.26 % F 2.26 % F

- % F -0.95 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(SiO₄)(PO₄)(SO₄)F_0.6(OH)_0.3Cl_0.1

Environment:

Contact metamorphic skarn.

IMA Status:

Approved IMA 1982

Locality:

Crestmore, Riverside, California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the composition and Reuben B. Ellestad (1900-1993), American analytical chemist of Minneapolis, Minnesota, USA.

Synonym:

Wilkeite

Fluorellestadite Image

Images:

Fluorellestadite

Comments: Blue-green granular fluorellestadite in calcium rich rock matrix.
Location: Kopeisk, Chelyabinsk District, Southern Urals, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Fluorellestadite Crystallography

Axial Ratios:

a:c = 1:0.72915

Cell Dimensions:

a = 9.485, c = 6.916, Z = 2; V = 538.84 Den(Calc)= 3.10

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): 2.84(1), 2.74(0.9), 1.852(0.8),

Physical Properties of Fluorellestadite

Cleavage:

None

Color:

Blue, Pale bluish green, Colorless.

Density:

3.03 - 3.07, Average = 3.05

Diaphaniety:

Transparent to Translucent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Sometimes Fluorescent, Short UV=bluish white, Long UV=weak white.

Luster:

Vitreous - Greasy

Streak:

bluish white

Optical Properties of Fluorellestadite

Gladstone-Dale:

CI meas= -0.065 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.048 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2105,KPDmeas= 0.2139,KC= 0.2008

Optical Data:

Uniaxial (-), e=1.65, w=1.655, bire=0.0050.

Calculated Properties of Fluorellestadite

Electron Density:

r_electron=3.09 gm/cc
note: r_{Fluorellestadite}=3.10 gm/cc.

Fermion Index

Fermion Index = 0.0038
Boson Index = 0.9962

Photoelectric:

PE_{Fluorellestadite}= 5.83 barns/electron
U=PE_{Fluorellestadite} x r_electron= 18.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fluorellestadite is Not Radioactive

Fluorellestadite Classification

Dana Class:

52.4.9.3 (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.27-10 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 Fluorellestadite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Fluorellestadite :
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 -École des Mines de Paris

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Fluorellestadite

Ca5(SiO4,PO4,SO4)3(F,OH,Cl)
Dana No: 52.4.9.3 Strunz No: VIII/B.27-10
Locality:

Notes: