Probably Soapstone. Small and shiny for such a soft rock. The "giant" fracture towards the bottom is much less visible in person; blame it on good lighting! I've tried breaking it and couldn't, so it's stable.

31mm x 16mm x 5mm.   Weight: 16.70 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...

SOA001