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If it is finer than the Swaty gosh it must be too fine to
use so I am tempted to offer you double your money
to take it off your hands. But sadly the rules here
do not let me -- :angel:

Use...

One thought on "where to use it when honing" is to
hone a small bar of mild steel with it and then
hone that same bit of steel on a known hone and
inspect the surface. If it polishes fine...

perhaps it is one of the carborundum hones...

If it is a natural hone it can sometimes be helpful to
inspect a photograph of the hone when it is wet to see
if it has any natural texture.
...