Artificial intelligent assistant

klingstone

ˈklingstone Min. Obs.
  [ad. G. klingstein.]
  = clinkstone.

1800 Henry Epit. Chem. (1808) 364 Soda [has been found] in basalt; in pitch-stone; and in kling-stone. 1811 Pinkerton Petral. I. 175 The klingstone employed in the preceding experiments was from the Donnersberg.

Oxford English Dictionary

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