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Reference.org
Inclusion (mineral)
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<p>In <a href="/facts/Mineralogy/MeIK9lx9">mineralogy</a>, an inclusion is any material trapped inside a <a href="/facts/Mineral/LkUFbNmv">mineral</a> during its formation. In <a href="/facts/Gemology/3bxqnE2b">gemology</a>, it is an object enclosed within a gemstone or reaching its surface from the interior. According to <a href="/facts/James_Hutton/Y8HUhQIu">James Hutton</a>'s law of inclusions, fragments included in a host rock are older than the host rock itself. </p>