volcanize

from The American Heritage® Dictionary of the English Language, 5th Edition.

• transitive verb To subject to or change by the effects of volcanic heat.

from The Century Dictionary.

• To subject to the action of volcanic forces; modify by volcanic action; render volcanic in character.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To subject to, or cause to undergo, volcanic heat, and to be affected by its action.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb transitive To expose to volcanic heat.