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We find the granite masses not only subject to decay from the external surface, by the decomposition of the feltspar, or the dissolution of its constituent parts, but also liable to be separated into blocks of different degrees of regularity, commonly rectangular or approaching to the rhombic shape.
In examining the tops of granite mountains, or where this rock is exposed to the weather, we may perceive those two species of decay proceeding together. The external surface of the stone, where there is a sufficient mixture of feltspar, is separating into grains which form a species of sand, being nothing but the particles of granite separating by means of the decaying sparry part.
There was Ferdinand Fitz-Fossillus Feltspar. He informed us all about internal fires and tertiary formations; about aeeriforms, fluidiforms, and solidiforms; about quartz and marl; about schist and schorl; about gypsum and trap; about talc and calc; about blende and horn-blende; about mica-slate and pudding-stone; about cyanite and lepidolite; about hematite and tremolite; about antimony and calcedony; about manganese and whatever you please.
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