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Calx is a substance formed from an ore or mineral that has been heated.[1]

Calx, especially of a metal, is now known as an oxide. According to the obsolete phlogiston theory, the calx was the true elemental substance, having lost its phlogiston in the process of combustion.[citation needed]

"Calx" is also sometimes used in older texts on artist's techniques to mean calcium oxide.[citation needed]


Calx is Latin for chalk or limestone, from the Greek χάλιξ (khaliks, “pebble”). It is not to be confused with the Latin homonym meaning heelbone (or calcaneus in modern medical Latin), which has an entirely separate derivation.

In popular culture[edit]


  1. ^ "calx | Definition of calx in English by Oxford Dictionaries". Oxford Dictionaries | English. Retrieved 2017-12-28.