My periodic table poster is now available! Allanite-Y. Description from the source: Allanite-Y, Arendal, Nordge. Black, lustrous, massive. 3x1,5x1 cm; 10 g. Source: Simone Citon Contributor: John Gray Acquired: 10 January, 2009 Text Updated: 10 January, 2009 Price: Trade Size: 1.2" Composition: (CaY)(Al2Fe)(O,OH,SiO4,Si2O7)