Abstract: An example method includes analyzing rock from an image of a sample region of the rock. The example method includes accessing element maps of the sample region in a database, with each element map including an array of pixels, and with each pixel having a value that represents how closely the pixel correlates to a chemical element; accessing a database storing threshold values for multiple chemical elements including the chemical element; determining a presence of a substance in a portion of the sample region corresponding to the pixel by determining whether a value of the pixel in each of the element maps is greater than, or less than, a threshold value for a corresponding chemical element; labeling the pixel based on the presence of the substance in the pixel; and outputting data representing the substance map for rendering on a graphical interface.

Abstract: An example method includes analyzing rock from an image of a sample region of the rock. The example method includes accessing element maps of the sample region in a database, with each element map including an array of pixels, and with each pixel having a value that represents how closely the pixel correlates to a chemical element; accessing a database storing threshold values for multiple chemical elements including the chemical element; determining a presence of a substance in a portion of the sample region corresponding to the pixel by determining whether a value of the pixel in each of the element maps is greater than, or less than, a threshold value for a corresponding chemical element; labeling the pixel based on the presence of the substance in the pixel; and outputting data representing the substance map for rendering on a graphical interface.