Ellestadite-(OH) Mineral Data

General Ellestadite-(OH) Information

Chemical Formula:

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

Composition:

Molecular Weight = 505.35 gm

Calcium 39.65 % Ca 55.48 % CaO

Silicon 8.34 % Si 17.83 % SiO₂

Hydrogen 0.12 % H 1.07 % H₂O

Sulfur 9.52 % S 23.76 % SO₃

Chlorine 2.10 % Cl 2.10 % Cl

- % Cl -0.47 % -O=Cl₂

Oxygen 39.89 % O

Fluorine 0.38 % F 0.38 % F

- % F -0.16 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(SiO₄)_1.5(SO₄)_1.5(OH)_0.6Cl_0.3F_0.1

Environment:

In a skarn.

IMA Status:

Approved IMA 1971

Locality:

Chichibu mine, 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:

Hydroxylellestadite - Renamed Ellestadite-(OH) by Mineralogical Record v39 (2008), 131

Ellestadite-(OH) Image

Images:

Yeelimite Ellestadite-(OH)

Comments: Ye'elimite and hydroxylellestadite intimately intergrown as a brownish aggregate in massive anhydrite.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Ellestadite-(OH)

Comments: Pale violet crystalline massive hydroxylellestadite.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ellestadite-(OH) Crystallography

Axial Ratios:

a:c = 1:0.72921

Cell Dimensions:

a = 9.491, c = 6.921, Z = 2; V = 539.91 Den(Calc)= 3.11

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): 2.84(1), 2.74(0.6), 1.85(0.5),2.8(0.5), 2.66(0.5), 3.46(0.4), 1.48(0.2), 1.96(0.2),

Physical Properties of Ellestadite-(OH)

Color:

Light pink, Purple gray, Pink.

Density:

3.02

Diaphaneity:

Translucent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

beige

Optical Properties of Ellestadite-(OH)

Gladstone-Dale:

CI meas= -0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2096,KPDmeas= 0.2159,KC= 0.2061
Ncalc = 1.62 - 1.64

Optical Data:

Uniaxial (-), e=1.65, w=1.654, bire=0.0040.

Calculated Properties of Ellestadite-(OH)

Electron Density:

Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Ellestadite-(OH) =3.11 gm/cc.

Fermion Index:

Fermion Index = 0.0053339523
Boson Index = 0.9946660477

Photoelectric:

PE_{Ellestadite-(OH)}= 5.89 barns/electron
U=PE_{Ellestadite-(OH)} x rElectron Density= 18.30 barns/cc.

Radioactivity:

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

Ellestadite-(OH) Classification

Dana Class:

52.04.09.04 (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-(OH) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Larousse des Mineraux,1981)

See Also:

Links to other databases for Ellestadite-(OH) :
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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Print or Cut-and-Paste your Ellestadite-(OH) Specimen Label here :

Ellestadite-(OH)

Ca5(SiO4,SO4)3(OH,Cl,F)
Dana No: 52.04.09.04 Strunz No: 09.AH.25
Locality:

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