284 CHLORITE SCHIST. 



geological view, which is fully described in that 

 work on the western island to which the reader 

 is here so often referred for the authority of many 

 of the present statements. 



In the same work, a full account, inadmissible 

 in this place, will also be found of its association, 

 in a very peculiar series, with hornblende schist, 

 quartz rock, micaceous schist, and other strata ; 

 in which series it presents the greater number 

 of the very peculiar varieties which are enume- 

 rated in the subjoined catalogue. In that list are 

 also enumerated those transitions and modifica- 

 tions, as yet undescribed, which it is unnecessary 

 to dwell on in these prefatory remarks. 



Although, when associated with micaceous 

 schist, it often forms beds of considerable dimen- 

 sions, the strata are commonly thin in the cases 

 last enumerated, and often indeed of such tenuity 

 as not to exceed a few inches. In such instances, 

 it is, commonly, very accurately fissile, and not 

 unfrequently so continuously laminar as to be ap- 

 plicable to architectural purposes, as a substitute 

 for common slate. More frequently, however, 

 the constitution of chlorite schist is too tender, 



