Nacre pronounced /ˈneɪkər/[1] or "NAY-kər", also known as mother of pearl, is an organic-inorganic composite material produced by some mollusks as an inner shell layer; it is also what makes up pearls. It is very strong, resilient, and iridescent.
http://www.youtube.com/watch?v=iTfB8Q6DpZ0
http://www.youtube.com/watch?v=iTfB8Q6DpZ0
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