Thanks fellas.

The small stone green stone was far harder to lap. Was very dished so quite the grind getting it flat. The Atoma 400 struggled so I had to resort to sandpaper to lose the bulk. Went from 80 to 240 then to the Atoma.

First hone with it, just plain water after a dilucot progression and it chipped the edge! Couldn't figure why, swore lots and then just finished on the La Dressente. Once the green stone dried I noticed some scratches on the face - must have been some rogue grains off the sandpaper that made it to the last Atoma run. Being so hard a stone, I think during the hone these scratches took little bites out of the edge. So spent another half hour or so going slow with the Atoma to finally rid it of the scratches (they were deeper than I thought!), then to the Chosera 1k and Shapton 5k to smooth it out.

Oddly the little green stone slurries on the Atoma 400 but it makes the Chosera 1k spew its green yeti snot. So must be a hard little bugger. Meanwhile the red stone slurries red/brown on the Chosera 1k. Tried the little green stone again to finish a Sheffield and it put quite a nice shine on the edge following the coticule. I'll know more tomorrow morning when I test shave but we might just have ourselves a finisher here.