Here's another house in Neumagan. It seems to have more regular stone than the houses we've seen thus far: 
 

 but it doesn't! Much mortar has been used, and orthogonal lines traced in the mortar, to give the look of a brick-like stone wall, but in fact the stones are still the irregular slivers and chunks that we've seen before. Note the two "blocks" in each of the upper two rows that are in fact each two chunks of slate: