410  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1906,  PART    I. 
CHINK    KNOB    PROSPECT. 
South  of  Chink  Knob,  near  the  main  road  through  Canada  Town! 
ship,  Jackson  County,  is  a  small  opening  several  feel  deep,  which  is 
described  here  only  because  of  the  peculiar  type  o\'  pegmatite  exposed. 
The  country  rock  is  mostly  mica  gneiss,  with  smaller  granitic  masses 
included.  These  are  doubtless  outliers  of  the  Larger  intrusions  of 
granite  in  the  neighborhood.  Some  of  them  assume  a  pegmatitil 
texture  in  places.  The  prospect  reveals  a  vein  of  pegmatite  from  31 
to  4  feet  wide.  (See  fig.  16.)  It  strikes  about  N.  5°  W.  and  dip! 
from  7")  to  so  E.j  cutting  one  of  the  coarse  granite  masses  already 
mentioned.  The  mica-gneiss  country  rock  a  few  rods  from  the  pros- 
pect had  a  strike  of  V  55     E.  and  a  dip  of  50     MY. 
The  vein  is  composed 
largely  of  quartz.  On  each 
side  and  down  through  the 
interior  of  this  quartz  there 
is  ;i  si  reak  or  band  of  feld- 
spar and  mica.  The  inte- 
rior band  consists  chiefly 
of  feldspar  with  a  small 
amount  of  mica,  but  in  the 
bands  between  the  walls 
and  the  quartz  mica  is 
probably  in  excess  of  the 
feldspar.  The  quartz  is 
massive  and  of  a  dark 
smoky  color.  It  has  a 
sheety  columnar  jointina 
about  normal  to  its  walls, 
probably  caused  by  later 
rock  movements.  The  mica  is  mostly  wedge-shaped  and  "A."  It  is] 
of  a  dark  smoky  color  and  partly  •'specked.'"  Blocks  from  :i  to  5 
inches  across  were  probably  the  Largest  found  during  the  prospecting 
..i  mica  prospeel  near  chink 
ty,  N.  I       I,  Coarse  granite;  ■_'.  mica 
and  feldspar;  •';.  quartz,  jointed;  I.  feldsparwith  little  mica. 
ADAMS    MINE. 
The  Adams  mine,  H  miles  southeast  of  Webster,  Jackson  County,] 
is  unique.  A  small  granite  dike  from  \\  to  S  feet  thick  cuts  sharply 
across  the  mica-gneiss  country  rock.  The  dike  strikes  \.  25°  to  301 
W.  and  dips  from  55  to  70°  XK.;  the  mica  gneiss  has  about  a  north- 
easterly strike,  with  a  dip  varying  from  nearly  vertical  to  70°  SE. 
This  granite  is  rather  fine  grained  and  lighl  gray  to  nearly  white  in 
color.  It  has  an  even  texture  and  shows  no  banding.  The  dike  has 
been  traced  over  loo  yards  along  the  strike  by  prospects,  openings! 
and  tunnels.     On  each  side  of  the  granite  throughout  its  exposure 
