This bluish-whit metal is extremely hard and brittle, and is used almost entirely to make the very hard alloys used in fountain pen nibs, phonograph needles, and instrument pivots.

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This bluish-whit metal is extremely hard and brittle, and is used almost entirely to make the very hard alloys used in fountain pen nibs, phonograph needles, and instrument pivots.

Rubidium

Osmium

Hafnium

Cadmium