Dumortierite 12mm Coin 8-Inch unique-rounds and much of the black

and much of the black Onyx on the market has been artificially colored

” Tourmaline is unusual in that it is both pyroelectric and piezoelectric

It occurs in bright turquoise blues and darker blues as well as rust reds

“Butter” suggests qualities of smoothness

where it gets its name

Dumortierite 12mm Coin 8-Inch unique-rounds and much of the blackDumortierite is an aluminum borosilicate mineral that varies in color from blue, green and brown to the more rare violet and pink. First described in 1881, the mineral was named for French paleontologist Eugene Durmortier (1803 1873). It is believed to bring the wearer water energy and to promote flow, control and orderliness.