The windowpane oyster is a bivalve marine mollusk in the family of Placunidae. They are edible, but valued more for their shells . The shells have been used for thousands of years as a glass substitute because of their durability and translucence. More recently, they have been used in the manufacture of decorative items such as chandeliers and lampshades; in this use, the shell is known as the capiz or kapis. Capiz shells are also used as raw materials for glue, chalk and varnish.
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