davyne

from The Century Dictionary.

• noun A Vesuvian mineral related to cancrinite: in part, perhaps, identical with microsommite.

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

• noun (Min.) A variety of nephelite from Vesuvius.

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

• noun mineralogy A hexagonal-dipyramidal mineral containing aluminum, calcium, chlorine, oxygen, potassium, silicon, sodium, and sulfur.