Granit eil. 345 portion of its iogredients. The mica often runs in veirfs or ftripes; it is ufed as a fire-ftone. The ftone called Aventurine, of which we have already fpoken, may be conlidered as of this fpecies. The aggregate of felfpar and mica is called Rapakivi, its colour is brown, or brownilh red, ft moulders by expofure to the air, but that is only whep the mica exceeds; when the felfpar exceeds, it forms a durable ftone called in Italy Granitene. Ferber Italy, 118. The aggregate of hornblende and mica is gene r rally dark green, and hence called Grunfiein. In fadt, however, the addition of mica to any ftone cannot, vyitH propriety, entitle it to be placed in the granitic order; as mica does not form a grain, but attaches itfelf indifferently to many forts of ftones. Thus we have micaceous limeftones, micaceous potftones, micaceous ar- gillites. The aggregate of quartz andßeatites is called Saxum molare by Wallerius; its colour he teils us is grey, green, or red. Mr. Mongez teils us it is all'o feund in Dauphine. Mr. D’Aubenton calls the aggregate of quartz andfelfpar, granatin. In (ome aggregates of quartz andßorl, flender capilliform needles of red fhorl traverfe the ftuartz, and crofs each other in various direc- tions. 'This ftone is in fome eftimation, and is Fy the Germans called Hairftont. It is found in Liberia, J Granilite,