FELDSPAR    AND    QUARTZ    DEPOSITS    OK     MAINE.  393 
in  amount,  but  black  tourmaline  is  moderately  abundant.  Its  sep- 
aration, however,  does  not  entail  great  labor.  Muscovite  (white 
mica)  is  very  abundant  and  of  commercial  quality  in  a  zone  about 
4  feet  wide  next  to  the  southwest  wall  of  the  pegmatite  mass,  but  in 
the  remainder  of  the  rock  it  occurs  only  in  scattered  plates,  mostly 
not  more  than  2  to  3  inches  across.  At  the  time  of  the  writer's  visit 
(September,  1906)  no  spar  had  been  marketed.  The  material  must 
be  hauled  about  3  miles  to  Hebron  station,  on  the  Portland  and  Rum- 
ford  Fa]  Is  Railway. 
OTHER    QUARRIES. 
Numerous  other  quarries  in  Maine  which  have  in  the  past  produced 
feldspar  and  quartz  were  visited  by  the  writer  and  will  be  described  in 
the  final  report. 
PRODUCTION. 
The  total  production  of  crude  feldspar  in  Maine  for  1905  was  2,312 
long  tons,  valued  at  $6,405.  The  production  of  ground  spar  was  9,317 
short  tons,  valued  at  $83,850. 
