The word "devilline" is a rare term used for a mineral of the pyroxene group. It is pronounced as "DEV-uhn-line" with the stress on the first syllable. The IPA phonetic transcription of this word would be /ˈdɛvəˌlaɪn/. The spelling of "devilline" is derived from the French word "dévilley", which is the name of the locality where it was first discovered. The mineral is primarily composed of calcium, magnesium, and iron silicate and is typically found in metamorphic rocks.