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 % H2 O
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)0.6 Cl0.3 F0.1
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:
Images:
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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEEllestadite-(OH) = 5.89 barns/electronU=PEEllestadite-(OH) x r Electron 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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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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