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The Periodic Elements in a rock would depend on what type of rock it is. Almost all of the elements can be found in some type of rock.

For example:

Sand, quartz, rock crystal, amethyst, agate, flint, jasper, and opal are all silicon oxides. Granite, hornblende, asbestos, feldspar, clay, mica are a few of the many silicate minerals.

Some minerals contain occluded helium which can be liberated by heating.

Chlorine is never found in nature as the free gas. It is found mainly as rock salt, carnallite, and sylvite.

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Q: What are the periodic elements in a rock?
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