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Zircon should not be confused with cubic zirconia, which is a man-made material.

Zircon is present in most soils and clastic sediments.

­The carbon-14 atoms that cosmic rays create combine with oxygen to form carbon dioxide, which plants absorb naturally and incorporate into plant fibers by photosynthesis.

Animals and people eat plants and take in carbon-14 as well.

Zircon Crystal: A small cluster of nicely-formed zircon crystals which clearly demonstrate that zircon is a member of the tetragonal crystal system. It is common throughout the world as a minor constituent of igneous, metamorphic, and sedimentary rocks.

Although brown zircon is not highly marketable, much of it can be altered to a rich blue color by heating in a reducing atmosphere to between 9 degrees Celsius.

The ratio of normal carbon (carbon-12) to carbon-14 in the air and in all living things at any given time is nearly constant.

Maybe one in a trillion carbon atoms are carbon-14.

Isotopes are distinguished from each other by giving the combined number of protons and neutrons in the nucleus.

For example, uranium 235 is the isotope of uranium that has 235 protons and neutrons in its nucleus rather than the more commonly occurring 238. noun A nearly identical person; near double: Like his isotope Paglia, Rush Limbaugh can be counted on to bury the occasional nugget of truth beneath his avalanche of infuriating extrapolation and phony statistics/It actually IS you.

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