I finally found the broader view I had of Sr Laura's grave, and yes, it is a table-like structure, made of granite. (The other side of the table memorializes a priest, but I didn't recognize his name). The stone most likely came from Cold Spring. (It's possible that Larry has 'more than a passing interest' in granite because of his state, Georgia, and it's own granite industry--being an eastern state, granite was found there much earlier than here in Minnesota). Wow!
Cold Spring, Minnesota pretty much grew around the granite industry. It's an attractive town in a beautiful part of the Sauk River valley. The granite works used to be right in town, but they moved in 2007 to the west side.
Sr Laura's memorial seems to be a stone called Moonlight Grey, quarried in Rockville, Minnesota.
☺...need any more info, yer Majesty?