What hone might this be ?

Bought this piece of rock in a brocante shop in coticule county last week - was full of grime and dirt so I guessed this wld be a coti...
it was packed in its original cardboard box with no markings at all
Cleaned it yesterday and lapped it... It is incredible hard and it was eating 80 / 120 grit paper with little effect
anyway I managed to have it lapped - not a coti at all cause it absorbs as hell and the back looks like carborundum with a
color from brownish orange to grey
the upper side looks yellowish with reddish particles
no markings on the stone (150 mm L x 50 mm W x 25 mm H)
checked some old threads and was wondering if this cld be a frictionite (without any markings ?)
thanks for helping me outAttachment 287194Attachment 287195Attachment 287196Attachment 287197Attachment 287198

It seems to be like a norton synthetic combo, with a low grit and and a very low grit. 200/1000 ? Good to remove teeth then make a new bevel.