We need contributions from SEPM members and others but to start you on your way we suggest that you visit web sites that link to petrographic educational materials. These can be tracked down using Wikipedia, the free encyclopedia or Google? Here are some we found!
An atlas site designed to aid undergraduate instruction at the Geology Department of the University of North Carolina with thin section photomicrographs and descriptions of 39 minerals, 20 plutonic textures, 14 volcanic textures, and 21 metamorphic textures. The user can switch between plane-polarized light and cross-polarized light view in selected images.
Atlas of Coals
231 photomicrographs of coals, cokes, chars, carbons, and graphite assembled by Professor John Crelling of Southern Illinois University at Carbondale. The atlas illustrates coals, cokes, chars, carbons, graphites, and other natural and man-made carbonaceous materials under the optical microscope so these materials can be characterizing for both scientific and industrial applications.
Minerals Under the Microscope Tutorial
Charlotte Gladstone of Earth Sciences of the University of Bristol has assembled these petrographic images along the lines of an on-line textbook.
Tutorial of Polarized Light Microscopy
Michael W. Davidson of Florida State University has assembled contrasting birefringent specimens to showing how to determine qualitative and quantitative aspects of crystallographic axes present in various materials. Good information
on general microscopy