Fanta
z 
Strack says Lamprotula is found in nearly all rivers, streams, and lakes in China, but is not used for pearl culture and practically no natural pearls have been found. I'm guessing they tried but for some reason it can't be done? Would be interesting if Jeremy's heard of any attempts . . . .
What are these small (up to 6 mm), frequently brittle nuclei used for? Nucleated freshwaters? Lower grade Akoya?
Perle