nontronite

English

Noun

nontronite (countable and uncountable, plural nontronites)

1. (mineralogy) An iron-rich clay mineral of the montmorillonite group
   • 1969, T. R. Meyers, The Geology of New Hampshire: Minerals and mines, page 18:

     Nontronite, a variety of chloropal occurs as a light yellow powder in druses of the North Conway granite (99, p. 312).

Further reading

• David Barthelmy (1997–2024) “Nontronite”, in Webmineral Mineralogy Database.
• “nontronite”, in Mindat.org‎^[1], Hudson Institute of Mineralogy, 2000–2024.