hand should not be too fine or else they will not be able to provide sufficient abrasiveness to the following stones accordingly the abrasive materials should generally be coarser than about 100 microns preferably coarser than 125 microns and may even be as large as about 1000 microns though no benefit has been found from so doing to prepare the finishing stones of the present invention the filler materials bonding agents and abrasive materials if used are intimately mixed generally the filler material is present as about 15 to about 80 percent of the mixture while the bonding agent is about 15 to about 80 percent and the abrasive material from 0 to about 30 percent all by weight on a dry basis preferably the filler material is about 30 to about 70 percent the bonding agent about 25 to about 60 percent and the abrasive material about 3 to about 15 percent most preferably the filler material will be about 45 to about 65 percent the bonding agent about 30 to about 50 percent and the abrasive material about 4 to about 10 percent depending upon the specific components selected and the method of to be used to form the stones it may be also be desirable to include a small amount of water or other liquid to create a plastic mixture which can then be readily formed if the bonding agent is.