James Madison University
James Madison University: Igneous Rock Classification
This site explores the classification of igneous rocks. Content addresses classification based on color and texture, mineral composition, and chemical composition.
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...
Australian Museum
Australian Museum: Igneous Rock Types
Learn about the different types of igneous rocks and how they are classified.
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.