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Prior to 1905 the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state.

Other minerals that also show these properties, but are less commonly used in radiometric dating are Apatite and sphene.

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We can also construct a Concordia diagram, which shows the values of Pb isotopes that would give concordant dates.

The Concordia curve can be calculated by defining the following: ).

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