MINERAL  PRODUCTS.

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sinking  of  a  well,  the  walls  of  which  caved  in,  revealing  a  cavern  in
limestone.  The  floor,  ceiling,  and  walls  of  the  cave  were  found  to  be
composed  of  celestite,  and  the  owner  reported  that  the  mineral  was
found  to  a  depth  of  22  feet  below  the  floor.
In  1904  a  deposit  of  celestite  was  developed  5  miles  north  and  a
little  west  of  Austin,  Tex.,  in  the  Mount  Donnell  and  Mount  Barker
district.  The  celestite  is  associated  with  strontianite,  Epsom  salts,
and  other  minerals,  and  occurs  in  a  flat-lying  arenaceous  and  argillaceous ­
  magnesian  limestone  bed  in  the  Glen  Itose  limestone  (Lower
Cretaceous).
An  occurrence  of  celestite  has  been  noted  near  Cedar  Cliff,  Mineral
County,  W.  Va.  The  rock  in  which  the  celestite  crystals  occur  is  a
thickly  bedded,  nearly  horizontal  argillaceous  limestone.  The  celestite ­
  occurs  in  crystalline  form  in  flattened  lenticular  cavities  or
pockets  from  a  foot  to  a  yard  in  diameter  and  from  3  to  7  inches  in
height.  In  the  adjacent  limestone  strontium  sulphate  was  found  so
abundantly  as  to  indicate  that  the  rock  was  strongly  impregnated.
Celestite  is  known  to  occur  at  Drummond,  Chippewa  County,  Mich.
In  Monroe  County  of  the  same  State  it  is  found  disseminated  through
dolomite,  and  at  the  point  especially  studied  the  upper  layer  of  the
rock  contained  over  14  per  cent  of  celestite.  Below  this  layer  there
is  a  porous  stratum  with  cavities  containing  celestite  and  free  sulphur. ­
  The  sulphur  is  found  in  considerable  quantities  and  was  probably ­
  formed  by  reduction  of  the  sulphate.
Celestite  has  also  been  found  near  Frankstown,  Blair  County,  Pa.  ;
in  Brown  County,  northeastern  Kansas;  in  Larimer  County,  Colo.;
in  cavities  in  limestone  near  Nashville,  Tenn.  ;  and  associated  in  fine,
clear  crystals  with  the  colemanite  of  Death  Valley,  San  Bernardino
County,  Cal.  Strontianite  occurs  with  celestite  in  New  York,  as
already  noted,  and  is  also  found  in  Mifflin  County,  Pa.
OTHER  PRODUCTS.
The  demand  for  several  of  the  minor  mineral  products  will  be
•stimulated  by  the  changes  in  trade  with  Europe,  with  the  result  of
increasing  materially  the  production  for  1914  and  following  years.
In  the  case  of  pottery  this  movement  toward  a  stronger  hold  of  the
domestic  market  is  already  well  under  way.  The  production  in  1913
was  the  largest  in  the  history  of  the  industry.  The  underlying
cause  of  this  prosperity  is  no  doubt  the  improvement  in  the  character ­
  of  the  American  product  in  texture,  finish,  color,  decoration,  and
the  prevention  of  crazing,  some  of  the  higher  grades  of  American
pottery  equaling  if  not  surpassing  some  of  the  best  imported  ware.
The  imports  of  pottery  have  always  been  more  or  less  interesting.
Por  many  years  the  value  of  the  imported  pottery  exceeded  the
value  of  that  made  at  home,  but  about  the  close  of  the  nineteenth