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Answer for the clue "The crackling or breaking up of certain crystals when they are heated ", 13 letters:
decrepitation

Word definitions for decrepitation in dictionaries

Wikipedia Word definitions in Wikipedia
Decrepitation is the noise produced when certain chemical compounds are heated. Such compounds include Lead nitrate and calcine .

WordNet Word definitions in WordNet
n. the crackling or breaking up of certain crystals when they are heated

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) The shattering of minerals by the action of heat, especially when accompanied by a crackling sound

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Decrepitation \De*crep`i*ta"tion\, n. [Cf. F. d['e]cr['e]pitation.] The act of decrepitating; a crackling noise, such as salt makes when roasting.