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Sea Crystal is a relatively rare mineral formed when seawater is struck by lightning. Sleek, glass-like and hard as iron, it is a valued commodity amongst both Mermaids and sea-dwelling Mamonme. Items crafted from it can fetch extraordinary prices. It has been speculated by some that one of the reasons that The Ships' Graveyard is closed to those not vouched for is that there is an abundance of said crystal there.