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quatrefoil

quatrefoil  

An ornamental design of four lobes or leaves as used in architectural tracery, resembling a flower or clover leaf.
flint

flint  

Variety of chert, which occurs commonly as nodules and bands in chalk. It is deposited in the porous, permeable structures of sponge, diatom, and echinoid skeletons and also in burrows.
glass

glass  

[Ma]An artificial material produced by fusing silica sand with an alkali such as potash or sodium. It was probably developed from faience in the Near East during the 3rd millennium bc, but was not ...

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