iolite การใช้

Praseolite is another iolite variety which results from heat treatment.
Prasiolite can be confused with the similarly colored " praseolite " which results from the heat treatment of iolite, a variety of cordierite.
Another name for blue iolite is Steinheilite, after Fabian Steinheil, the Russian military governor of Finland who observed that it was a different mineral from quartz.
The stone was iolite, a blue gem, neither faceted nor cabochon but something in between, a pyramid with four rounded sides and a smoothly polished peak.
"' Cordierite "'( mineralogy ) or "'iolite "'( gemology ) is a magnesium iron aluminium polymorph exists, indialite, which is isostructural with beryl and has a random distribution of Al in the (, ) 6 rings.