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Mohs hardness, Nb-x polyhedra
P1006159-1
P1006159-1
P1006159-1
P1006269-1
P1006269-1
P1006269-1
P1006330-1
P1006330-1
P1006330-1
P1006366-1
P1006366-1
P1006366-1
P1006377-1
P1006377-1
P1006377-1