Baghdadite Mineral Data

Baghdadite Mineral Data +

General Baghdadite Information

Chemical Formula:

Ca3(Zr,Ti)Si2O9

Composition:

Molecular Weight = 400.79 gm

Calcium 30.00 % Ca 41.98 % CaO

Zirconium 17.07 % Zr 23.06 % ZrO₂

Titanium 2.99 % Ti 4.98 % TiO₂

Silicon 14.02 % Si 29.98 % SiO₂

Oxygen 35.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Zr_0.75Ti_0.25Si₂O₉

Environment:

In a melilite skarn in contact with banded diorite, in roof pendant xenoliths of calc-silicate marbles and hornfels.

IMA Status:

Approved IMA 1982

Locality:

In Dupezeh Mountain, near Hero Town, Qala-Diza region, northeastern Iraq. Link to MinDat.org Location Data.

Name Origin:

For Baghdad, the capital of Iraq.

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Baghdadite Crystallography

Axial Ratios:

a:b:c =1.0255:1:0.7244

Cell Dimensions:

a = 10.42, b = 10.16, c = 7.36, Z = 4; beta = 91.1° V = 779.04 Den(Calc)= 3.42

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.84(1), 2.98(0.85), 3.23(0.8),

Physical Properties of Baghdadite

Cleavage:

None

Color:

Colorless.

Density:

3.48

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Baghdadite

Gladstone-Dale:

CI meas= 0.133 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.118 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.193,KPDmeas= 0.1897,KC= 0.2187

Optical Data:

Biaxial (+), a=1.652, b=1.658, g=1.67, bire=0.0180, 2V(Calc)=72, 2V(Meas)=72.

Calculated Properties of Baghdadite

Electron Density:

r_electron=3.34 gm/cc
note: r_Baghdadite=3.42 gm/cc.

Fermion Index

Fermion Index = 0.03013
Boson Index = 0.96987

Photoelectric:

PE_Baghdadite= 27.28 barns/electron
U=PE_Baghdadite x r_electron= 91.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Baghdadite is Not Radioactive

Baghdadite Classification

Dana Class:

56.2.4.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.4)Cuspidine - Wohlerite group

56.2.4.1 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

56.2.4.2 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

56.2.4.3 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

56.2.4.4 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

56.2.4.5 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

56.2.4.6 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

56.2.4.7 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

56.2.4.8 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1

56.2.4.9 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

56.2.4.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

56.2.4.11 Jennite Ca9Si6O18(OH)6·8H2O P1 1

56.2.4.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2·3.5(H2O) Unk Ortho

56.2.4.13 Na-komarovite? Na6CaNb6[Si4O12F2·4(H2O) C mmm 2/m 2/m 2/m

56.2.4.14 Suolunite Ca2Si2O5(OH)2·(H2O) F dd2 mm2

56.2.4.15 Mongolite Ca4Nb6Si5O24(OH)10·5(H2O) Unk Tetra

56.2.4.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1

56.2.4.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

Strunz Class:

VIII/C.11-30 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.11 - Wöhlerite - Lavenite series

VIII/C.11-05 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

VIII/C.11-10 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

VIII/C.11-12 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

VIII/C.11-15 Normandite! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 2₁/a 2/m

VIII/C.11-20 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

VIII/C.11-25 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

VIII/C.11-30 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

VIII/C.11-40 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

VIII/C.11-50 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

Other Baghdadite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Baghdadite

Ca3(Zr,Ti)Si2O9
Dana No: 56.2.4.1 Strunz No: VIII/C.11-30
Locality:

Notes: