Ellestadite-(Cl) Mineral Data

General Ellestadite-(Cl) Information

Chemical Formula:

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

Composition:

Molecular Weight = 511.78 gm

Calcium 39.16 % Ca 54.79 % CaO

Silicon 5.49 % Si 11.74 % SiO₂

Phosphorus 6.05 % P 13.87 % P₂O₅

Hydrogen 0.06 % H 0.53 % H₂O

Sulfur 6.27 % S 15.64 % SO₃

Chlorine 4.16 % Cl 4.16 % Cl

- % Cl -0.94 % -O=Cl₂

Oxygen 38.45 % O

Fluorine 0.37 % F 0.37 % F

- % F -0.16 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

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

Environment:

In a skarn.

IMA Status:

Approved IMA 1982

Locality:

Takiue Saitama Prefecture, Japan. 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:

Chlorellestadite - Renamed Ellestadite-(Cl) by Mineralogical Record v39 (2008), 131

Ellestadite-(Cl) Image

Images:

Ellestadite-(Cl)

Comments: Pale yellow rounded crystals of ellestadite-(Cl) (chlorellestadite), in blue marble.
Location: Jensen Quarry, Jurupa, Riverside Co., California, USA. Scale: Crystal Length 5 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Ellestadite-(Cl) Crystallography

Axial Ratios:

a:c = 1:0.72523

Cell Dimensions:

a = 9.51, c = 6.897, Z = 2; V = 540.20 Den(Calc)= 3.15

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/I_o): 2.75(1), 2.84(0.95), 2.28(0.4),2.8(0.4), 3.45(0.4), 1.85(0.3), 1.96(0.3), 2.65(0.3),

Physical Properties of Ellestadite-(Cl)

Color:

Colorless, Light pink, Pale rose, Orange.

Density:

3.07

Diaphaneity:

Transparent to Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Compact - Occurs as a compact mass.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ellestadite-(Cl)

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2068,KPDmeas= 0.2122,KC= 0.2076
Ncalc = 1.64 - 1.65

Optical Data:

Uniaxial (-), e=1.649-1.65, w=1.652-1.655, bire=0.0030-0.0050.

Calculated Properties of Ellestadite-(Cl)

Electron Density:

Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Ellestadite-(Cl) =3.15 gm/cc.

Fermion Index:

Fermion Index = 0.0037459723
Boson Index = 0.9962540277

Photoelectric:

PE_{Ellestadite-(Cl)}= 5.96 barns/electron
U=PE_{Ellestadite-(Cl)} x rElectron Density= 18.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ellestadite-(Cl) is Not Radioactive

Ellestadite-(Cl) Classification

Dana Class:

52.04.09.05 (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

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 Ellestadite-(Cl) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Ellestadite-(Cl) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ellestadite-(Cl)

Ca5(SiO4,PO4,SO4)3(Cl,OH,F)
Dana No: 52.04.09.05 Strunz No: 09.AH.25
Locality:

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