Purple "Pimpleback" Shell 8x16mm Faceted Rectangle Bead - 15-16 Inch Shape_Drum though significant deposits have since

though significant deposits have since been found in Brazil and Sri Lanka

Discovered in Greenland in the late 1890's

while its variations in color are better known by other names: Emerald (green)

2-3 medium ranging 18-25mm

dark specks or veins

Purple "Pimpleback" Shell 8x16mm Faceted Rectangle Bead - 15-16 Inch Shape_Drum though significant deposits have sinceA "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.