Vol. 70.] OF THE COUNTRY ABOUKD HU>"TLT. 277 



muscovite, apatite, and zircon. The foliation is seen in section 

 to be accompanied by slight mdrtel-struktur, due to movement 

 during consolidation. 



The quartz with its aligned inclusions is perfectly normal, and, 

 having crystallized at a comparatively late period, has been able 

 to corrode the biotite to some extent. Both orthoclastic and 

 plagioclastic felspars are represented, usually a little turbid, owing 

 to the decomposition that has begun. Orthoclase is less abundant 

 than the large crystals of microcline, while the plagioclases are 

 represented by both andesine and oligoclase, the latter in small 

 amount. Biotite is the only abundant ferromagnesian mineral, 

 but presents no unusual features. It alters to a greenish chloritic 

 mica, and is associated sparingly with muscovite. 



The rare pink garnets are associated with green mica altering 

 to ordinary chlorite and ripidolitic chlorite. The zircons often 

 possess a greenish-yellow colour strongly suggestive of monazite, 

 but spectroscopic examination did not reveal any didymium lines. 



As in so many of the younger microcline- granites of the 

 Highlands, there occur here also micropegmatitic intergrowths 

 of quartz and orthoclase. In this rock there are two t} r pes, of 

 which the rarer occurs as grains in the microcline. The other, 

 embracing the bulk of the eutectic, belongs to the fringing type 

 surrounding and projecting into the felspar. 1 



The following analysis of the rock has been made : — 



III. 



SiO, 72-30 



TiO; 0-37 



Al.,63 12-91 



Fe 2 3 0-59 



FeO 2-04 



MnO 0-10 



(CoNi)O nt. fd. 



BaO 0-03 



CaO 1-95 



MgO 0-82 



K 2 4-63 



Na.,0 3-68 



Li 2 nt.fd. 



H 2 Oatl05°C 0-03 



H 2 above 105° C 0'55 



P„0 0-10 



FeS* nt.fd. 



Total 100-10 



III. Carvichen Quarry. (E. G. Radley, Anal.) 



(e) The hypabyssal rocks. — Basic dykes on the east side 

 of the Deveron are limited to the pegmatite occurring near the 

 Mission Kirk, Kinnoir. In the quarry, this rock is largely 



1 W. Mackie, Trans. Geol. Soc. Edin. vol. ix (1908-10) pp. 274-75. 



