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One medium and one small bar of Barium metal. Barium is extremely reactive and samples are often heavily tarnished, but this sample is only moderately tarnished.
The Alkaline Earth Metals group: |be|, |mg|, |ca|, |sr|, and |ba|
Large crystal of Barium metal sealed in an ampoule. Barium is extremely reactive and samples of this element are often dark with tarnish. This sample is shiny with a brassy sheen and a couple strips of dark oxidation. The shape of this crystal looks like a bunch of feathers, or wild onion leaves.
The Alkaline Metals group: |be|, |mg|, |ca|, |sr|, and |ba|
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