White sharp crystals of this rare mineral, Iraqite-(La), associated to pink villiaumite in a contrasting matrix. Very nice under the microscope for the contrast of colors. From: Aris Quarry, Windhoek, Khomas Region, Namibia. — Photo: David Hospital · CC BY-SA 4.0
Iraqite-(La)
Iraqite-(La) is an IMA-recognized mineral species in the silicate class, with the chemical formula KCa₂(La,Ce,Th)Si₈O₂₀.
It is a member of the Steacyite structural group.
Key properties: Mohs hardness 4.5; specific gravity 3.27; Whitish streak; Dull to pearly luster; optically uniaxial.
IMA symbol Irq-La, IMA status: approved, named in 1973.
Found in granite in contact with dolomitic marble containing olivine and diopside.
The name refers to the country of origin, Iraq, and lanthanum in the composition.