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schwarzer Glaskopfstresses
chem. псиломелан (MnO2(MnO, RaO, K2O, H2O))
geol. псиломелан
geol., mineral. чёрная стеклянная голова (твёрдый вад)
met. чёрная стеклянная голова
mining. псиломелон (чёрная стеклянная голова)

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