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Primary Structures in Igneous Rocks [Pdf]
This 23-page slideshow explains what intrusive and extrusive igneous rocks are and the characteristics of their structures. Each type of structure is accompanied by one or more images. (Website for Mining Engineering students at Mehran...
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Chemeketa Community College: Igneous Rock Identification
This resource contains detailed summaries of eight different igneous minerals. It also has enlarged pictures of the minerals as they appear embedded in igneous rock.