Please help me identify these two rocks?
The photos are pretty bad but a couple of things still stand out, the translucent sample shows apparent conchoidal fracture which coupled with the colour and level of transparency makes me think it's green Obsidian. Obsidian is a volcanic glass and can be mistaken for manmade glass, what is sold as obsidian in many stores is in fact not a natural substance at all. Also as I should have pointed out originally without some scale and clarity the sample presented may well be a broken piece of manmade glass.

The second photo is a little clearer, the apparent fine layering and particular shade of green looks just like a sample of fused volcanic ash I have that came from Mount Tongariro.