Quote:
Originally Posted by alocky
That's a bit of a problem with working from images. To me they look like quartz phenocrysts in a porphyritic rhyolite, especially because of the crystalline habit, which you would not expect in a fusilinid.
Best way for you to tell is to drop a bit of pool acid on the rock. If it goes nuts = limestone. If not = rhyolite.
Cheers,
Andrew
|
Thanks Andrew.
There is a mild reaction when battery acid is added to the rock, nothing like a violent effervescent reaction once would expect if it was limestone however.
I have taken some microscope shots of the rock.
These might prove useful.
Regards
Steven