370 PRIMARY LIMESTONE. 



from oxydes of iron, or from the intermixture of 

 other minerals ; in which latter case they rank 

 under the following division. 



SECOND DIVISION. 



Compound : of two ingredients. 

 * A. Limestone with mica interspersed. 



a. Foliated, irregular, large granular, re- 



sembling granitic gneiss. Rannoeh. 



b. Straight laminar, resembling micaceous 



schist of various aspects. Blair in 

 Atholl. 



B. Interlaminated with argillaceous schist. 

 Isla, &c. 



C. With hornblende interspersed. Loch Laggan, 

 &c. 



D. With sahlite or augit of various colours in- 

 terspersed. Tirey, &c. 



E. With talc interspersed. 



F. With noble serpentine or steatite intermixed 

 or diffused so intimately as to communicate a general 

 colour. 



G. With garnets, crystallized imperfectly, or else 

 uniformly diffused. 



H. With quartz, either in distinct grains, or so 

 minute as only to be detected on analysis. 

 I. With felspar. 



K. Impregnated with bitumen. Sutherland. 

 L. With tremolite minutely intermixed. 

 M. With actinolite intermixed in the same manner. 



