From Dan Hummer: The Mindat website also has a webpage where you can generate a list of mineral species that match a specific set of physical properties input by the user. It’s a decent tool, but it’s sometimes difficult to narrow the list of options, because all 6000+ species are listed regardless of whether they comprise 40% of Earth’s surface or occur in milligram quantities at only one locality. So it’s good to have some basic background under your belt on common minerals and physical properties before using, so that you have the context needed to interpret results:   Mindat.org | | | | | | | | | | | Mindat.org Mindat.org is the world's leading website about minerals and where they come from. | | |   Best, Dan