perlite is a cooked and exploded rock......(so is vermiculite and asbestos).........
perlite is popped and is jagged and really rough textured........Rich Zuchowski told me long ago (*I think it was him) ...that if you use it get the babies out of it before they shed because it will scratch them all up....sounds likely......it is really coarse......
I personally find that it does NOT hold moisture all that well....the top layer dried out fast and I had to keep wetting it.all the water would sink down into it and the top stayed too dry........vermiculite worked better...yet all I could ever find is the fine stuff not the bigger ,courser vermic......
to solve all troubles I mixed the perlite with the vermic.......works better ......or as well as all else........
I mixed it to get rid of the perlite...I went to a supply store near here and asked for a bag of "block fill".....the bag is HUGE.........(they fill cinder blocks with perlite as they lay each course to make the room more soundproof......).....
.......so....use it...just watch the moisture and get the kids off it as they hatch......
.........good luck...........
oh......and don't breathe the dust from any of them as much as possible........
-----
...............
.........
...........
...................