Eggs, banana and crookneck squash give Adalon similar poops, though they still tend to come out in one pile and have some form to them. I don't know what makes it more solid, but I don't ever feed him just one item in his meal.
I don't know if this is what's going on with your skink, but Adalon had a couple odd looking formations around his mouth that he would scrape against a slate tile so much that I had to remove it for a while.
I am about 90% sure that they were caused by eating a snail; the slime was all around his mouth, probably wasn't cleaned well and hardened which caused him to start rubbing against things to get it off. A lot of it didn't come off with a warm damp wash cloth and he managed to do a little damage to one of the scales under his mouth. Two weeks later though he shed and the formations were gone and the scale damage looked alot better.
A few months and a few more sheds later, his scales all look completely normal.
Pics of the mouth damage from 01/15/2011:
Pics of healthy mouth

from 05/24/2011:
