helenite

English

Alternative forms

• Helenite

Etymology

From Helen +‎ -ite. From Mount St Helens, whose volcanic ash is used to manufacture helenite.

Noun

helenite (uncountable)

1. A greenish artificial gem, made by melting and vitrifying volcanic ash from the 1980 eruption of Mount Saint Helens.

Synonyms

• Mount St. Helens obsidian