macdonaldite en · NOUN
Etymology
From MacDonald + -ite after Gordon A. MacDonald, a volcanologist at the University of Hawaii.
Meanings
-
An orthorhombic-dipyramidal mineral containing barium, calcium, hydrogen, oxygen, and silicon.
It is typically a vein-forming mineral associated with macdonaldite, opal, and witherite.
2012, H. Earl Pemberton, Minerals of California, page 2406: