here are some sites that may help with crystal identification, or at least get you started! (note that i haven’t used all of them myself and can’t vouch for their reliability)
1 (you can search by colour here by hovering over the “gemstones” link)
4 (this one is alphabetical)
5 (also alphabetical, but with good quality photos of tumble stones)
7 (these are the gemstones on the site, there’s also a link for minerals that might be useful)
8 (you can search by colour here, and click “more about this stone” for both polished and rough photos)
tip: you could have a crystal that looks completely different from the photos here of the same crystal, i always like to do a quick google image search to see more photos
(yourmemehell hope this helps!)