33 8 Aggregated Stonts. S E C T I O N XI. Of Aggregated Stones. These confift of either grains (angular raaffes) of ftones fimply compadted together, and forming either uniform or flaty maffes; or of ftones of one or more fpecies, inhering in another ftone, which may be confidered as their bafis or cement; or of rounded ilones of different forts, adhering to or inhering in fome ocher; or of maffes of different aggregates inhering or adhe ring to each other. Ali thefe, though fufceptible of infinite variety, might at leaft, in general bc diftinguifhed by appropriate names, ifa claflifi- cation were now for the firft time to be attempted ; but unhappily various combinations have already been denoted by particular names, under which they are now knovvn by mineralogical writers fo narrowed and reflrained in their lignification as to be incapable of being brought under general divifions; and to introduce new names would produce confufion. Hence, I Ihall confine my- felf to the explanation of the denominations al ready in ufe, as they are underftood and applied by the moft exadf writers on this fubjctf. Granite. This name in the ftridteft fenfe denotes an ag' grcgate of quartZj felfpar, and mica ; all in very variable