My periodic table poster is now available! Calcite. Description from the source: Calcite (Ca CO3 trig.), Pinzgau, Austria. Classic crystal clusters. 2,5x1,8x1,5 cm; 11 g with box. Source: Simone Citon Contributor: John Gray Acquired: 30 September, 2008 Text Updated: 1 October, 2008 Price: Trade Size: 1" Composition: CaCO3