Concerning the image redistributed in this example 
Credit: U.S. Geological Survey 
Department of the Interior/USGS
U.S. Geological Survey/photo by Christopher Nye

More information can be found here https://commons.wikimedia.org/wiki/File:Photomicrograph_of_rock_thin_section_Gabbroic_inclusion.jpg

Concerning the image explaining the workflow
Data Courtesy Stratum Reservoir 