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  Rubidium metal in small ampoule
Rubidium metal in small ampoule.

  Ampoule with rubidium
Ampoule with rubidium.

  Rubidium oscillator Drops of metallic Rb in the middle of image
Rubidium oscillator (from the rubidium clock). On the right photo possible to see small drops of Rb metal (in the center of the photo).