Purple "Pimpleback" Shell 8x16mm Faceted Rectangle Bead - 15-16 Inch Shape_Drum dark specks or veins

dark specks or veins

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

Carnelian is a glassy

2-3 medium ranging 18-25mm

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

Purple "Pimpleback" Shell 8x16mm Faceted Rectangle Bead - 15-16 Inch Shape_Drum dark specks or veinsA "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.