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Rock dated by rubidium decay()
An example of the element Rubidium

Sample Image
Rubidium Rock dated by rubidium decay
Rock dated by rubidium decay. (External Sample)
This very, very old rock was dated by measuring the decay of rubidium in it. Sort of like carbon-dating for really old things.
Location: The Boston Museum of Science
Photographed: 2 October, 2002
Size: 36
Purity: <0.01%
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