Mystery Rock

So today I am asking for your help.
Yesterday, I was cutting some rock in the shop and here is one that I cut open.

It is about 5 cm x 3 cm and the inclusions are between 0.5 and 1.5 cm. It is definitely a silicate bit apart from that, the only thing I can think of is some sort of chalcedony that might have inclusions that were formed by gas or H2O replacement.
It is absolutely beautiful and I'm going to try and cut two slabs to make pendants because I know it will polish beautifully.
As someone used to say on TV, "The truth is out there!"
Also just finishing a second lot from my new (old) tumbler and there is some beautiful material in it. I'll post some pics tomorrow.