The act of including, or the state of being included; limitation; restriction; as, the lines of inclusion of his policy.,
A foreign substance, either liquid or solid, usually of minute size, inclosed in the mass of a mineral.
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This could possibly refer to a geode, hollow round nodules with
crystal linings, or it could refer to an inclusion, which is a
transparent mineral that shows inclusions of another, eg. rutilated
quartz.