http://beyond.divinedivinity.net/help/act3_temple_district.htmyes, take the mirror out of Anbuklar's grave (number 21 on this pic) - then place it in front of the church doors - as this is one of the locations the stone shows. then go back to the stone, click on it. It will stop at the church pic - quest is solved.
http://www.kiya1.de/beyond/act3screens/Act3Rixx10.jpghttp://www.kiya1.de/beyond/act3screens/Act3Rixx20.jpgThis manuscript explains a bit about the mirror. It's in clear writing, not in Raanaar, as I took it with me to Act 4, where I could read it properly. But it is not so difficult in Raanaar either. and as you see, Anbuklar is the author of these lines - the same one, where you get the mirror from (grave).