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    Zircon dating

    The gemstone usually develops in rock near water tables, located in semiarid and arid environments.The chemicals in turquoise come from adjacent rock, leached out by rain and groundwater.

    If nothing disturbs the grain to release any of this radiogenic lead, dating it is straightforward in concept.Uranium comes in two common isotopes with atomic weights of 235 and 238 (we'll call them 235U and 238U).Both are unstable and radioactive, shedding nuclear particles in a cascade that doesn't stop until they become lead (Pb).Zircon is especially useful because it frequently contains uranium in substitution for zirconium, but does not incorporate lead (as shown by the absence of Lead-204).Thus all the lead in the zircon can be assumed to be radiogenic.

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