396  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   L906,   PART    I. 
specimens  examined.  It  is  probable  that  part  of  the  soda  is  chemJ 
ically  united  with  the  potash  in  the  microcline  and  that  the  feldspaj 
is  in  realitv  a  soda  microcline.  Analysis  4  of  the  table  represents  a< 
pink  microcline  from  the  feldspar  quarries  at  Bedford,  Ontario,  and  is 
inserted  for  purposes  of  comparison. 
Analyses  of  microclim  feldspars. 
i. 
2. 
3. 
4. 
Silica  (SiOj) 
65.95 
IS.  (M) 
.12 
1 .  ().-) 
Trace. 
12.  13 
2.  1 1 
65.85 
19.32 
.21 
.  56 
.08 
14.10 
65.33 
20.  96 
.71 
None. 
None. 
1       L0.65 
\        1.37 
65.  40 
18.80 
Trace] 
None. 
None. 
Potash  (KjO)                                   
13.90 
Soda    v-                           
1 .  95 
.60 
> 
99.36 
LOO.  L5 
99.02 
100.61 
1.  Fink  microcline  Eeldspar  from  quarry  of    Kinkle's   Sons,   Bedford,  \.  V.     Analysis  by  John  C. 
Wiarda  &  Co. 
2.  l'ink  microcline  feldspaT  from  quarry  of  Kinkle's  Sons,  Bedford,  \.  Y.     Bull.  New  York  Statf 
Museum  No.  93,  L905,  p.  926. 
3.  Buff-colored  microcline  feldspar  from  quarry  of  Uberl  Hobby,  North  Castle,  N.  Y. 
4.  Pink  microcline  feldspar  from  quarry  of   Richardson  &  Sons.    Bedford,  Ontario.     Analysis  by 
Heinrich  Ries,  Cornell  University. 
The  pink  feldspar  is  in  part  pure  and  in  part  intergrown  with 
quartz.  This  intergrowth  consists  of  single  crystals  of  quartz  and 
feldspar  penetrating  each  other  in  such  a  manner  that  on  certain 
cleavage  Paces  of  the  feldspar  the  quartz  forms  a  peculiar  pattern 
somewhat  resembling  the  cuneiform  inscriptions  of  the  ancients. 
From  this  fancied  resemblance  to  ancient  writings  the  rock  has  been 
called  graphic  granite.  There  is  every  gradation  from  pure  feldspar 
through  coarse-grained  graphic  granite  into  fine  graphic  granite; 
The  pink  feldspar,  pure  or  in  intergrowth  with  quartz,  generally 
occurs  in  somewhal  irregular  but  sharply  bounded  areas  within  the 
general  pegmatite  mass.  In  the  southernmost  of  the  upper  quarried 
these  constitute  about  one-half  of  the  whole  pegmatite  mass.  A  lew 
of  the  smaller  pink  feldspar  areas  have  perfectly  straight  boundaries 
which  parallel  the  cleavage  directions  within  the  crystal.  One 
sharply-outlined  mass  of  pink  feldspar  :\  feel  long  by  11  feet  wide 
was  bordered  on  all  sides  by  white  quartz.  The  larger  masses  are  as 
a  rule  inclosed  parti}  by  pure  quartz  and  partly  by  irregularly  asso- 
ciated white  quartz  and  white  feldspar,  in  varying  proportions,  with 
a  little  pink  feldspar,  biotite,  black  tourmaline,  beryl,  etc.  The  white 
feldspar  is  shown  by  microscopic  examination  to  be  largely  albite  and 
constitutes  the  second  important  feldspar  variety  characteristic  of 
this  quarry.  The  parts  of  the  pegmatite  characterized  by  its  pres- 
ence are  in  a  few  places  graphic  granite,  but  for  the  most  part  show  a 
very  irregular  texture  and  varying  proportions  of  feldspar  and  quartz 
from  point  to  point. 
The  mica  of  these  quarries  is  mainly  muscovite,  which  is  commonly 
