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i had a few mystery hones that turn out to be india stone's i dont use slurry on india stones

india makes a off white slurry i have a lot of aluminum oxide and silicon carbide stones that make white to off white slurry.

indian stone which are synthetic make white slurry too

i have to go on what the op said that it smells like a coti but my gut tells me its synthetic i dont like the red/brown spots the way the chip looks look at the grit in the close up pic !

i'm not liking those brown/red spots but if it looks like a coti and smells like a coti then most likey its a coti

your right its not and ark and it is slate backed how does it smell when lapping the yellow side does it smell like your other coti's ?

try to get some better pics up it looks like a soft and hard ark glued together but cant tell for sure .