Can you test hardness or fluorescence?
It scratched window glass.
And i have no uv test.
Can you get hold of a piece of quartz to see if it will scratch it?
Yes quartiz scratch the stone.
Now the question is will it also scratch quartz? If so that will pretty much identify it.
No it does not scratch it.
ok so it is softer than quartz - so that rules out quartz/chalcedony. What environment/locality did you find it in?
Please elaborate on "Volcanic Environment"