Nacre sources is an 8-letter term which can be solved by the crossword answer 'ABALONES'. Abalones are a type of mollusk found in coastal waters, and they are known for their beautiful shells which are composed of nacre. Nacre is a type of material which is made up of calcium carbonate and conchiolin, and it is often used to make jewelry and other decorative items. Abalones are a common source of nacre, and their shells are highly sought after for their beauty and durability.