Vo].  49.]  CRYSTALLINE  SCHISTS  OF  THE  MALVERN  HILLS. 
407 
The  fragments  of  felspar  immersed  in  this  groundinass  are 
smaller  than  in  the  preceding  slides.  Some  of  them  are  seen  to  he 
parts  of  the  same  crystal ;  while  others  lie  isolated  in  the  matrix. 
These  seams  of  fragments,  being  roughly  parallel,  give  to  the  rock  its 
sedimentary  aspect.  Both  quartz  and  felspar  are  present.  The 
Pig.  2  (Slide  473). 
Diorite  No.  3.  Decomposition  further  advanced  ;  felspars  crushed  into  minute 
fragments,  which  lie  in  irregular  seams.  The  matrix  of  the  fragments  is 
chiefly  brown  mica,  chlorite,  epidote,  and  opacite. 
latter  is  often  water-clear,  and  polarizes  in  the  patchy  manner 
described  under  No.  466,  but  not  exactly  like  a  true  mosaic.  Many 
of  the  fragments  do  not  give  interference-figures,  and  the  difficulty 
of  distinguishing  quartz  from  felspar  becomes  yet  greater  in  the 
following  slides,  in  which  the  fragments  are  still  smaller  and  the 
felspar  often  polarizes  as  a  true  mosaic.  In  the  remaining  slides  of 
this  series,  I  shall  therefore  often  refer  to  the  water-clear  mineral 
as  ‘  quartz-felspar.’ 
A  few  yards  farther  west,  the  rock  becomes  sounder,  and,  under 
the  microscope,  it  is  clearer,  the  disseminated  ferruginous  matter 
aggregating  in  strings,  granules,  or  definite  crystalline  forms. 
Reconstruction  appears  also  among  the  other  minerals.  The  next 
slide  is  taken  as  typical  of  the  partially  reconstructed  rock. 
No.  485.  Prom  the  ridge  north  of  the  quarry. — Black  mica  does 
not  appear  in  considerable  quantity,  the  hornblende  being  represented 
in  great  part  by  chlorite.  The  latter  is  partly  in  irregular  patches, 
as  before ;  but  associated  with  this  form  of  the  mineral  are 
numerous,  minute,  pale-green  granules,  sometimes  shaped  like 
globulites,  margarites,  and  longulites.  Microliths  of  a  pale-green 
