GRANITE, after having been worked into form with heavy dumpy picks, and then with the hammer and chisel or diamond point, is 1st ground to a moderately smooth surface with a heavy iron plate fed with sharp sand or coarse emery and water, and put into reciprocal motion, or in turned works the granite is put in quick circular revolution against the rubber. 2ndly the work is smoothed with another iron plate and coarse flour emery. 3dly it is further advanced by wooden rubbers with fine flour emery, the rubbers being made the end-way of the wood. 4thly and lastly crocus is used on thick felt laid on wood or metal. On account of the softness of the mica compared with the quartz and felspar, which together constitute the granite, the hard rubbers must be persevered in until near the conclusion, to keep the work flat, otherwise the mica is too quickly worn away, and leaves minute hollows. Sometimes lumps of granite are used as rubbers instead of the iron plates. 2. - Granite, when worked by the lapidary is slit and roughly ground in the common mode adopted both with Carneltan and Alabaster, namely the slicer with diamond powder and the roughing or lead mill with coarse emery; afterwards it is found best to smooth it on a mahogany wheel with flour emery, and to polish it on the lead wheel with rottenstone; but it requires great care to prevent the soft mica from being unduly worn away.