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"Science fiction operates a little bit like science itself, in principle. You've got thousands of people exploring ideas, putting forth their own hypotheses. Most of them are dead wrong; a few stand the test of time; everything looks kind of quaint in hind"
- Peter Watts

Crysknife  
  A knife blade ground from the tooth of a giant sandworm of Dune.  

The crysknife is the preferred hand-to-hand fighting weapon of the Fremen, the native people of Arrakis (the planet Dune).

Slowly, Mapes reached into the neck of her dress, brought out a dark sheath. A black handle with deep finger ridges protruded from it. She took sheath in one hand and handle in the other, withdrew a milk-white blade, held it up. The blade seemed to shine and glitter with a light of its own. It was double-edged like a kindjal and the blade was perhaps twenty centimeters long.


(Mapes shows crysknife from 'Dune' by Frank Herbert)

"Do you know this, my Lady?" Mapes asked.

It could only be one thing, Jessica knew, the fabled crysknife of Arrakis, the blade that had never been taken off the planet, and was known only by rumor and wild gossip.

Technovelgy from Dune, by Frank Herbert.
Published by Putnam in 1965
Additional resources -

It is manufactured in two forms from teeth taken from dead sandworms. The two forms are "fixed" and "unfixed." An unfixed knife requires proximity to a human body's electrical field to prevent disintegration. Fixed knives are chemically treated for storage. All are about 20 centimeters long.

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  More Ideas and Technology from Dune
  More Ideas and Technology by Frank Herbert
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