Martian drilled hole

After drilling into a sedimentary rock layer in Gale Crater, Curiosity is naturally curious as to what's in the hole. The MAHLI camera is used to get a closeup of the fine, clumpy dust around the perimeter of the hole, with a view into the hole. 

original images:
http://mars.jpl.nasa.gov/msl-raw-images/msss/01361/mhli/1361MH0003990010502189C00_DXXX.jpg 
http://mars.jpl.nasa.gov/msl-raw-images/msss/01361/mhli/1361MH0003990010502195C00_DXXX.jpg

The diameter of the hole is about 1.6 cm.


Here the dark interior values are stretched to increase the contrast on bits and pieces at the bottom of the hole:

 (stereo pair, cross-view)

 Detail across center of the same images:

 (stereo pair, cross-view)

Another MAHLI photo with artificial light, focused near the bottom of the hole (http://mars.jpl.nasa.gov/msl-raw-images/msss/01365/mhli/1365MH0006210000502375R00_DXXX.jpg):