Formula: Ca3(Zr,Ti)Si2O9
Origin of name: After locality; Baghdad, Iraq
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Contact twins, individuals having [010] in common
Unit cell: a = 7.36 Å, b = 10.177 Å, c = 10.451 Å, b = 90.87° (some report a as c and c as a)
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Microscopic grains, stumpy prismatic
Hardness: 6
Specific gravity: 3.46 to 3.48
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Slowly soluble in concentrated HCl. Shows dull gray with greenish tint cathodeluminescence. Found in melilite skarns in contact with diorite, in roof pendant xenoliths of calc-silicate marbles and hornfels.
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