Manti Temple Rock -- Book and Frame

Recently a reader sent me the following email: "I stumbled upon your blog first about a year ago while researching an interesting find I picked up in Denver. It's a pocket-sized book made of stone with 'Manti Temple Rock' on one side and an architectural model of the Manti Temple enclosed behind glass on the other side. Origin/provenance is unknown." 

Compare the above photo to the one from the DUP Museum in Salt Lake City.