I think this a form of Seam Agate, but this freeform beauty reminds me of an ice cream sandwich with blue-gray cookies instead of chocolate! There is some porosity on the white part; you can see several tiny pits in the surface. But you gotta look hard...

33mm x 24mm x 6mm.   Weight: 38.65 carats.

Every one of my cabochons is custom cut to take the best advantage of the particular slab from which it is fashioned. Colors may vary somewhat from what is pictured due to differences in computer monitors.

Click the image on the right to see the cabochon super-sized...

SAG003