When I presented Stone #12, also found at Slope Point, I discussed why it was possible it was not rhyolite. The same argument applies to Stone #16, which was polished in the same batch, finishing the process early this month:
Certainly a volcanic stone, the close-up views reveal its extraordinary complexity and tiny intricate details.
Other side of Stone #16.
It is probably a rhyolite, one of the interesting variety of volcanic stones to be found at Slope Point.
Stone of the Day #17 is here (yet to be linked). The Index to the January 2022 Stone of the Day Series is here.
I have a rock that I can not identify maybe you can help
Hi John, sorry about the delay in replying, I lost track of your Comment. If you send a couple of photos of the rock to me at john.tumblestone@gmail.com, and say where you found it, then I might be able to help. John