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Iam still unsure but that doesnt matter....in thinking on the Hindostan you have to check the properties as far as i read and experienced these stones can act differently in their grit estimation

Thanks Neil for the addition, as been written the Coticule thing was only a guess.....
in thinking on a Hindostan also the surface on this picture is in my thinking quite untypical for a Hindostan,...

Thanks Piet sorry thats something i missed as been said thinking on a Sandstone i mostly thought on a hard stone....then the Hindostan will be the right choice....

I agree with euclid that this is a hindostan from just looking at the pictures...in general these stones should be hard as their nature beeing is a Sandstone....so that does not really fit in this...