wahwan]  PYROXENE QUARTZ.  643 
Quartz,  thin  section  of,  from  California,  Nevada  City,  crushed  vein,  and  incipi- 
ent ribbon  structure Ann  17,  n,  pp  136-137 
thin  section  of,  from  California,  Nevada  City,  in  granodiorite,  showing 
metasoniatic  replacement Ann  17,  n,  pp  134-135 
from  Lake  Superior  district,  in  quartziferous  porphyry  ..Mon  v,  pp  100-101 
from  Minnesota,  Pigeon  Point,  from  mottled  quartzite,  broken  crystals 
of..... '. Bull  109,  p  86 
southwestern,  in  biotite  from  hypersthene-free  gabbro-schist. .  .Bull  157, 
pp  142-143 
from  Nevada,  Eureka  district,  from  rhyolite,  showing  fractures  about 
glass  inclusions  in Mon  xx,  pp  398-399 
Quartz  conglomerate,  thin  section  of,  from  Nevada,  Eureka  district Mon  xx, 
pp  398-399 
Quartz  crystal,  statistics  of inn  19,  vi  cont,  pp  528-529; 
Ann  20,  vi  cont,  p  615;  Ann  21,  vi  cont,  pp  463,  478 
thin  section  of,  from    Minnesota,  Pigeon  Point,  corroded  in  red  quartz- 
ite   Bull  109,  p  93 
Quartz  fragments,  enlargements  of,  and  genesis  of  quartzites Bull  8,  pp  11-43 
thin  section  of,  from  Nevada,  Eureka  district,  Magpie  Hill;  in  basalt... Mon  xx, 
pp  398-399 
from  the  Northwest,  crystal-faced  enlargements  of Ann  5,  pp  222-223 
Quartz  lenses  in  bedding  planes  of  sericite-schist,  origin  of Ann  16,  i,  pp  556-558 
Quartz    phenocryst,    thin    section    of,    from    Michigan,    Crystal    Falls    dis- 
trict  Mon  xxxvi,  pp  268-269 
Quartz  rock,  analysis  of,  from  Lake  Superior,  used  in  steel  refractories..  .Bull  25,  p  39 
Quartz  and  chlorite,  thin  section  of,  from  Nevada,  Washoe  district,  from  por- 
phyritic  diorite Mon  in,  pp  150-151 
Quartz  and  feldspar,  statistics  of Ann  18,  v  cont,  pp  1365-1368;  Ann  19,  vi  cont, 
p  657;  Ann   20,  vi  cont,  p  74:>;  Ann  21,  vi  cont,  pp  593-596 
Quartz,  vein,  of  Alaska,  Yukon  district Ann  18,  in,  pp  290-294 
of  Colorado,  Telluride  district Ann  18,  in,  pp  787-788 
thin  section  of,  from  California,  Grass  Valley Ann  17,  n,  pp  132-133 
from  California,  Nevada  City Ann  17,  n,  pp  132-133 
from  Colorado,  Telluride  quadrangle,  Fairview  mine,  showing  arrange- 
ments of  inclusions  in Ann  18,  in,  p  787 
Quartz-alunite,  analysis  of,  from  Colorado,  Democrat  Hill  and  Mount  Robinson, 
Ann  17,  n,  pp  315,  316;  Bull  148,  p  169;  Bull  168,  p  151 
Quartz-alunite  rocks,  of  Colorado,  Rosita  Hills Ann  17,  n,  pp  314-319 
Qnartz-augite-diorite,  thin  section  of,  from  Sierra  Nevada Ann  17,  i,  pp  760-761 
Quartz-banakite,analysisof,  from  Yellowstone  Park,  Stinkingwater  River.  .Monxxxn, 
ii,  p  347;  Bull  89,  p  67;  Bull  148,  p  128;  Bull  168,  p  102 
thin  section  of,  from  Yellowstone  Park Mon  xxxn,  n,  pp  350-351 
Qnartz-basalt,  analyses  of,  from  California,  Lassen  Peak  region Bull  148, 
pp  198, 199;  Bull  150,  p  253;  Bull  168,  pp  184, 185 
analysis  of,  from  Virginia,  Chatham Ann  21,  in,  p  81 
from  California,  Snag  Lake  Cinder  Cone,  description  of,  as  one  of  the  edu- 
cational series Bull  150,  pp  252-254 
in  California,  Lassen  Peak  quadrangle GF  15,  p  2 
Quartz-bearing  basalt,  distribution  of Bull  79,  pp  30-33 
from  Arizona Bull  66,  p  21 
from  California,  northern Bull  79 
from  Colorado Bull  66,  p  22 
from  New  Mexico,  Tewan  Mountains Bull  66,  pp  16,  20 
Quartz-biotite-hornblende-diorite,  analyses  of,  from  Mary  land,  Cecil  County.  .Bull  168, 
p45 
