One of the mysteries of the English language finally explained.
A manganese-containing mineral that occurs as grey to black, platy, or finely crystalline masses, and is dimorphous with pyrolusite.
1940s. From the name of Lewis S. Ramsdell, U.S. mineralogist, who described the mineral in 1932 ( Amer. Mineral 17 143–9) + -ite.
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