According to [[Player:Seara]], you are supposed to be able to analyse all rock types. So it is most likely a bug. [[User:Xandaros|Xandaros]] ([[User talk:Xandaros|talk]])
:It is bug http://forum.wurmonline.com/index.php?/topic/82691-rock-shard-analyzing-in-wurm-11-knowledge-and-speculation/page-2#entry827421 [[User:Malcolm|Malcolm]] ([[User talk:Malcolm|talk]]) 20:48, 22 June 2013 (CEST)