decrepitate

verb2

1. •
   To roast (a salt or mineral) until it stops crackling in the fire.

   • so will it come to pass in a pot of salt, although decrepitated; and so also in a pot of Snow. — 1646
2. •
   Of salts and minerals, to crackle when heated, indicating a sudden breakdown of their particles.

   • It is, however, remarkable, that the greater number of bodies which decrepitate, are really anhydrous and fixed, such as sulphate of potash, sulphate of barytes, chloride of sodium, &c. — 1837