Swirl Rhyolite Rough
Swirl Rhyolite has a fabulous
pattern and produces great slabs as well as interesting cabochons with unusual
figuring. This rhyolite can have some fracturing along the banding. So it's
best not to use very coarse grit wheels, which isn't a problem because Swirl
Rhyolite is not very hard. Finished stones of Swirl Rhyolite are really beautiful
and reminiscent of Crazy Lace Agate. Swirl Rhyolite polishes best with diamond
and a follow up with Zam. Approximate Mohs hardness 4.5 to 5.5.