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:
Ca3 Zr0.75 Ti0.25 Si2 O9
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.
Name Pronunciation:
Baghdadite + Pronunciation
Baghdadite Image
Images:
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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /a
X Ray Diffraction:
By Intensity(I/Io ): 2.84(1), 2.98(0.85), 3.23(0.8),
Physical Properties of Baghdadite
Cleavage:
None
Color:
Colorless.
Density:
3.48
Diaphaneity:
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 Ncalc = 1.75 - 1.76
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:
Bulk Density (Electron Density)=3.34 gm/cc note: Specific Gravity of Baghdadite =3.42 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEBaghdadite = 27.28 barns/electronU=PEBaghdadite x r Electron Density= 91.02 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Baghdadite is Not Radioactive
Baghdadite Classification
Dana Class:
56.02.04.01 (56) Sorosilicate Si2O7 Groups and O, OH, F. and H2O
(56.02) with cations in [4] and/or >[4] coordination
(56.02.04) Cuspidine - Wohlerite group
56.02.04.01 Baghdadite Ca3(Zr,Ti)Si2O9 P 21 /a 2/m
56.02.04.02 Burpalite Na2CaZrSi2O7F2 P 21 /a 2/m
56.02.04.03 Cuspidine Ca4Si2O7(F,OH)2 P 21 /c 2/m
56.02.04.04 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21 /a 2/m
56.02.04.05 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21 /m 2/m
56.02.04.06 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
56.02.04.07 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
56.02.04.08 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
56.02.04.09 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
56.02.04.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21 /n 2/m
56.02.04.11 Jennite Ca9Si6O18(OH)6•8H2O P1 1
56.02.04.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho
56.02.04.13 Natrokomarovite * Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m
56.02.04.14 Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2
56.02.04.15 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra
56.02.04.16 Kristiansenite ! Ca2ScSn(Si2O7)(Si2O6OH) C1 1
56.02.04.17 Kochite ! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1
56.02.04.18 Marianoite ! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m
Strunz Class:
09.BE.17 09 - SILICATES (Germanates)
09.B - Sorosilicates
09.BE -Si2O7 groups with additional anions;
09.BE.17 Baghdadite Ca3(Zr,Ti)Si2O9 P 21 /a 2/m
09.BE.17 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21 /n 2/m
09.BE.17 Burpalite Na2CaZrSi2O7F2 P 21 /a 2/m
09.BE.17 Cuspidine Ca4Si2O7(F,OH)2 P 21 /c 2/m
09.BE.17 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
09.BE.17 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21 /a 2/m
09.BE.17 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
09.BE.17 Normandite ! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 21 /a 2/m
09.BE.17 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21 /m 2/m
09.BE.17 Marianoite ! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m
Other Baghdadite Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Baghdadite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Baghdadite
Ca3(Zr,Ti)Si2O9
Dana No: 56.02.04.01 Strunz No: 09.BE.17
Locality:
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