James Madison University
James Madison University: Keys to Igneous Rock Classification
Click for different identification keys for igneous rocks to help you classify them correctly. Includes various color/texture keys as well as classification charts. (NOTE: At the time of writing this, the PDF links were configured...
CK-12 Foundation
Ck 12: Earth Science: Igneous Rock Classification
[Free Registration/Login may be required to access all resource tools.] How to classify igneous rocks.
CK-12 Foundation
Ck 12: Earth Science: Igneous Rock Classification
[Free Registration/Login may be required to access all resource tools.] Presents the classifications of igneous rocks based on silica content.
CK-12 Foundation
Ck 12: Earth Science: Igneous Rock Classification Study Guide
A quick review of the basic concepts in igneous rock identification.