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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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Cal Poly Pomona: Igneous Rocks
If you need a technical summary of igneous rock classification, then this resource is worth checking out. It has several different diagrams to help you visualize the classification process.
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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.
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Geology.com: Rocks: Photos of Common Intrusive and Extrusive Igneous Rock Types
Explains the difference between intrusive and extrusive igneous rocks and provides pictures and descriptions of common igneous rock types in each category.
CK-12 Foundation
Ck 12: Earth Science: Intrusive and Extrusive Igneous Rocks
[Free Registration/Login may be required to access all resource tools.] Describes the features of intrusive and extrusive igneous rocks that cool slowly and rapidly, respectively.