Purple "Pimpleback" Shell 8x16mm Faceted Rectangle Bead - 15-16 Inch Shape_Drum 2-3 medium ranging 18-25mm

2-3 medium ranging 18-25mm

Discovered in Greenland in the late 1890's

An iron oxide-hydroxide mineral

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

dark specks or veins

Purple "Pimpleback" Shell 8x16mm Faceted Rectangle Bead - 15-16 Inch Shape_Drum 2-3 medium ranging 18-25mmA "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.