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| − | [[Rock]] surrounding an [[igneous rock|igneous]] [[intrusion]] or below a [[lava]] flow.
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| − | Pellant, p. 250
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| − | =Sources= | |
| − | *Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
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| − | [[category:geology]]
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