It revealed that the composition of the object was mostly a mix of copper alloy (75%), with tin (7%) and lead (18%). The ...

Parker thinks it would've taken an expert to make the dodecahedron that the Norton Disney group found. An analysis of the material found it's 75% copper, 18% lead, and 7% tin. "The composition is ...

The dodecahedron found at Norton Disney was analyzed to consist out of 75% copper, 7% tin and 18% lead, with a width of 8.6 cm and weighing in at 254 grams. The polyhedral gold bead from Khao Sam ...