delessite

English

Noun

delessite (countable and uncountable, plural delessites)

1. (mineralogy) A magnesium-rich form of chamosite that is a member of the chlorite group.
   • 1905, B. K. Emerson, “Plumose diabase and palagonite from the Holyoke trap sheet”, in Bulletin of the Geological Society of America‎^[1], volume 16, page 105:

     Several delessites and chloropals occurring in basalts have a composition very close to that of the glass.

Derived terms

• delessitic

Further reading

• David Barthelmy (1997–2025) “Delessite”, in Webmineral Mineralogy Database.
• “delessite”, in Mindat.org‎^[2], Hudson Institute of Mineralogy, 2000–2025.