1
Mn : manganese. A2. Natural occurrence, minerals: native metal, solid solution, silicide, and carbide: sulfides and related compounds: halogenides and oxyhalogenides: oxides of type MO : system number 56 /
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2
Rare earth elements. C12A. Compounds with carbon : system number 39 /
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3
Th : thorium. Supplement vol. C6. Thorium carbides : system number 44 /
Book