Loganstone
"Loganstone" is the name of the lighter that took Magnesia (Marble) to the Whorl. I got a little bothered about the name yesterday, so I did a Google search and came up with
<http://www.quinion.com/words/weirdwords/ww-log1.htm>
<http://www.pitt.edu/~dash/monuments.html>.
It's an old English name for a rocking stone, with Druidic/magical associations. There's a famous one in Cornwall.
The name fits in with the motions attributed to landers, and also fits in with the provenance of the Whorl as an asteriod.
-- Dan
*This is WHORL, for discussion of Gene Wolfe's Book of the Long Sun.