Fordite Pendant.

Fordite, Detroit City Agate or Motor City Agate.

These are all the names given to this stone.

Its not actually a stone, but the build up of run offs of car pant from the Ford Factories when they used to to hand spray the cars up until the 1980's in Detroit and this one is from the Chrysler factory.

These are getting harder to find because the whole process has changed.

Dimensions:

Size of chain is 55mm x 40mm

See Video for a more comprehensive view.