Ellestadite Mineral Data

General Ellestadite Information

Chemical Formula:

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

Composition:

Molecular Weight = 500.48 gm

Calcium 40.04 % Ca 56.02 % CaO

Silicon 10.10 % Si 21.61 % SiO₂

Phosphorus 5.57 % P 12.76 % P₂O₅

Hydrogen 0.06 % H 0.54 % H₂O

Sulfur 1.92 % S 4.80 % SO₃

Chlorine 0.71 % Cl 0.71 % Cl

- % Cl -0.16 % -O=Cl₂

Oxygen 39.32 % O

Fluorine 2.28 % F 2.28 % F

- % F -0.96 % -O=F₂

______ ______

100.00 % 97.60 % = TOTAL OXIDE

Empirical Formula:

Ca₅(SiO₄)_1.8(PO₄)_0.9(SO₄)_0.3F_0.6(OH)_0.3Cl_0.1

Environment:

Metamorphosed limestone. Group name for hydroxylellestadite - chlorellestadite series.

IMA Status:

Not Approved IMA

Locality:

Crestmore quarry, 5 miles NW of Riverside, Riverside Co. California. Link to MinDat.org Location Data.

Name Origin:

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

Synonym:

ICSD 39775

PDF 25-173

Wilkeite

Ellestadite Image

Images:

Ellestadite

Comments: Honey yellow hexagonal dipyramids of ellestadite in light blue marble matrix.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: 6 x 7.7 cm.
© John Veevaert

Ellestadite Crystallography

Crystal System:

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

Optical Properties of Ellestadite

Optical Data:

Calculated Properties of Ellestadite

Fermion Index:

Fermion Index = 0.0055907355
Boson Index = 0.9944092645

Photoelectric:

PE_Ellestadite= 5.75 barns/electron
U=PE_Ellestadite x rElectron Density= . barns/cc.

Radioactivity:

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

Ellestadite Classification

Dana Class:

52.04.09.00 (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 Information

See Also:

Links to other databases for Ellestadite :
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
11 - WWW-MINCRYST

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Ask about Ellestadite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Ellestadite Specimen Label here :

Ellestadite

Ca5(SiO4,PO4,SO4)3(F,OH,Cl)
Dana No: 52.04.09.00 Strunz No: 09.AH.25
Locality:

Notes: