Diffusion modeling tools
* Excel spreadsheet with finite difference model for Fe-Mg diffusion in olivine
* Mathematica file with finite difference model for Fe-Mg diffusion in olivine
Both programs are related to the publication:
Costa, F., Dohmen, R., Chakraborty S. (2008) Time Scales of Magmatic Processes from Modeling the Zoning Patterns of Crystals. Reviews in Mineralogy and Geochemistry 69. 545-594.
which contains more explanation of the programs and should be cited when using them in publications.