If one asks a question with the identification-request tag, he will see this warning during the review step:

However, rock identification questions are now off topic on Earth Science SE. I thus suggest that we remove the warning associated with the tag, or better that we replace it by another warning saying that rock identification questions are off topic.

The tag is still being used by (on topic) fossil identification requests, so the warning could be replaced by something like:

Rock identification questions are off topic. If you are looking for help identifying a fossil, please include...

And a small guide, maybe with a link to a more complete guide, as was the case for rocks before. There is a nice one provided by user John here.