Purple "Pimpleback" Shell 8x16mm Faceted Rectangle Bead - 15-16 Inch Stone Type_Druzy Agate and can display a nearly

and can display a nearly emerald green color due to the presence of Chromium within the stone

It is a potent combination of these minerals

The inner layer of the shell is composed of nacre (mother-of-pearl)

Copper within the Pectolite creates the beautiful blue and turquoise colors in the stone

Purple "Pimpleback" Shell 8x16mm Faceted Rectangle Bead - 15-16 Inch Stone Type_Druzy Agate and can display a nearlyA "pimpleback" is a freshwater mussel (Cyclonaias pustulosa) common in North American rivers, characterized by a thick, yellow brown to brown shell covered in bumps (pustules). While not typically purple, the inner lining (nacre) can be iridescent, and related species in the pimpleback complex are sometimes found in Texas waters.