Mineral Information and Data:

Baghdadite
Ca3ZrO2(Si2O7) [CNMNC approved formula]

Named for Baghdad, the capital of Iraq.

IMA status : Approved Species 1982 (IMA1982-075)
CLASSIFICATION 
Dana
(8th edition) :
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
  
Nickel-Strunz
(10th edition) :
09.BE.17
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BE) Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 10.42Å, b = 10.16Å, c = 7.36Å; β = 91.1°
Crystal Habit: Crystals stumpy prismatic, to 250 μm.
Twinning: Contact twins, individuals having [010] in common
  
Color: Colorless
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 6
Measured Density: 3.48 (calculated) g/cm3
Fracture: Conchoidal
  
Geologic Setting: In a melilite skarn in contact with banded diorite, in roof pendant xenoliths of calc-silicate marbles and hornfels.
Mineral Association: Akermanite, perovskite, schorlomite, monticellite, wollastonite, foshagite, calcite, phlogopite, spinel, cuspidine, baddeleyite, pyrrhotite, djerfisherite, valleriite (melilite skarn); andesine, kaersutite, titanian augite, ilmenite, titanian magnetite, xonotlite (banded diorite).
  

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