Greetings!
I have found references to h-card at movim/movim#393 and we have applied it to https://git.xmpp-it.net/sch/Blasta/src/branch/main/xhtml/contact.xhtml
You would see there class attributes with the following values u-xmpp, u-xmpp-mix, u-xmpp-muc, and u-irc, including u-email which is the only one which is mentioned on microformats.org
Please define IRC and XMPP.
Thank you,
Schimon