One of the mysteries of the English language finally explained.
A green arsenite of manganese, Mn₅ 3+(As3+O₃)₃(OH,Cl), occurring as fine-grained encrustations in fissures in dolomite and haematite and crystallizing in the cubic system.
1950s. From the name of Nils H. Magnusson, former director of the Geological Survey of Sweden + -ite.
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