Our expert gemologist would really help you on this. However, as per my knowledge the first one seems to be smoky quartz and second one simily quartz with blue tint, the last two resemble organic stones created as an outcome of animal fossils.
To get a complete confirmation, you should take these to a gemologist; who will go through a proper chemical examination and get it confirmed.
GOD BLESS!!!
Srinivasa Temkar