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Interesting slurry. So far I can cay any of CFs going through my hands was more or less white.
With the colour they vary from greyish, green to blue.
Jeltz you hope it will be HAD killer. Not a...

Strangely enough. Today I went to one of CF quarries and have seen a piece of raw roch which was showing simmilar pattern to yours. It leaves me with 3 possibilities CF, TOS and Idwall hone.

I was watching that stone but thought that it was more like TOS. If that turns up to be CF then my expectation would be one of the newer versions around 10 000 grit.