Manganese is a hard metal. 

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Alpha-Mn.png
Beta-Mn.png
Phase diagram of manganese (1975).png
Chlorid manganatý.JPG
KMnO4 in H2O.jpg
Lascaux painting.jpg
Gahn Johan Gottlieb.jpg
ManganeseOreUSGOV.jpg
Mineraly.sk - psilomelan.jpg
Spiegeleisen.jpg
Dendrites01.jpg
The Searchlight Rhodochrosite Crystal.jpg
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Content adapted from Wikipedia
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Readability: FK 12.5
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Vital Level 4