An interesting lightly tumbled specimen of what I think is green chrysocolla in clear agate. Its colour comes from its copper content. I don't know the provenance of this but I suspect it is from the USA judging from the other specimens that it came with. It is discreetly mounted on a polished black onyx base.
Just under 1/2 inch (1.3 cm) wide, 5/16 inch (0.8 cm) deep, 7/16 inch (1.1 cm) tall.