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Sepiolite

/ˈsiːpiəlaɪt/noun

A soft white porous clay mineral, known to pipe carvers as meerschaum.

The Greek roots

σηπία
sēpía
cuttlefish
+
λίθος
líthos
stone

Literally: cuttlefish stone

The story of the word

The mineral is light, chalky and porous, so nineteenth-century mineralogists named it after the cuttlefish, whose internal bone has exactly that look and feel. σηπία gives English sepia twice over: the animal, and the brown ink drawn from it, which is why old photographs are described by the colour of a squid's defence. Most of the world's supply still comes from around Eskişehir in Turkey, where it is dug out damp and soft enough to carve with a knife.

How it travelled
Ancient Greek → scientific coinage → English
First recorded
19th century

Same family

sepiamonolithlithographymegalith

In a sentence

The sepiolite pipe had darkened to amber after forty years of use.

Cat litter is mostly sepiolite or bentonite, depending on the brand.

Built on the same root

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