Here is a gorgeous slab of a material I am unfamiliar with! It appears to be a Sagenetic Jasper with tons of beauty and character! This slab should work into a couple decent sized cabochons! One thing is certain though, this is one stunning slab!
Measurements (inches - longest - approx): 4 x 2.1 x .2
The last photo has been taken dry so that you may see any defects. The other photos have been taken wet to simulate a polish.