﻿150 
  

  

  natural 
  size 
  in 
  his 
  possession. 
  It 
  is 
  a 
  flattened 
  cube. 
  The 
  lateral 
  

   planes 
  P 
  P", 
  as 
  well 
  as 
  the 
  replacements 
  of 
  the 
  lower 
  solid 
  angles 
  a, 
  

   are 
  extremely 
  brilliant 
  and 
  regular 
  ; 
  but 
  the 
  upper 
  solid 
  angles 
  and 
  the 
  

   terminal 
  edges, 
  are 
  replaced 
  by 
  planes, 
  which 
  successively 
  rise, 
  in 
  a 
  

   step-like 
  manner 
  to 
  the 
  apex, 
  forming 
  a 
  low 
  pyramid. 
  See 
  his 
  explana- 
  

   tion 
  of 
  the 
  mode 
  of 
  formation, 
  Phillips 
  1 
  Mineralogy, 
  Suppl., 
  p. 
  623. 
  

  

  WHITE 
  LEAD 
  ORE. 
  

  

  (Mineralogy 
  of 
  New- 
  York, 
  page 
  414.) 
  

  

  Small 
  crystals 
  of 
  carbonate 
  of 
  lead, 
  an 
  eighth 
  of 
  an 
  inch 
  or 
  less 
  in 
  

   length, 
  are 
  occasionally 
  found 
  sprinkled 
  thickly 
  over 
  the 
  surface 
  of 
  the 
  

   galena 
  of 
  Rossie, 
  which 
  when 
  this 
  is 
  the 
  case 
  is 
  deeply 
  roughened 
  or 
  

   corroded. 
  The 
  crystals 
  are 
  striated 
  prisms, 
  terminating 
  in 
  four 
  bril- 
  

   liant 
  planes, 
  two 
  of 
  which 
  meet 
  at 
  an 
  angle 
  of 
  117° 
  nearly, 
  and 
  the 
  

   other 
  two 
  at 
  an 
  angle 
  of 
  88°. 
  The 
  crystalline 
  form, 
  as 
  well 
  as 
  the 
  

   blowpipe 
  characters 
  prove 
  that 
  the 
  mineral 
  is 
  carbonate 
  of 
  lead. 
  Dr. 
  

   G. 
  Hadley, 
  in 
  Sill. 
  Jour., 
  Jan., 
  1847. 
  

  

  NATIVE 
  COPPER. 
  

   (Mineralogy 
  of 
  New- 
  York, 
  page 
  420.) 
  

  

  Prof. 
  Dewey 
  states 
  that 
  he 
  has 
  found 
  some 
  speculae 
  of 
  native 
  copper 
  

   in 
  the 
  pentamerus 
  limestone, 
  (probably 
  near 
  Rochester, 
  Monroe 
  county.) 
  

   Pyritous 
  copper 
  and 
  green 
  carbonate 
  of 
  copper 
  occur 
  in 
  the 
  same 
  mass. 
  

   Hall's 
  Rep. 
  on 
  Geol., 
  \th 
  Dist., 
  p. 
  67. 
  

  

  This 
  mineral 
  is 
  also 
  occasionally 
  found 
  in 
  the 
  Taconic 
  slate. 
  Em- 
  

   mons 
  1 
  Rep. 
  on 
  Geol., 
  2d 
  Dist., 
  p. 
  158. 
  

  

  RUTILE. 
  

  

  (Mineralogy 
  of 
  New- 
  York, 
  page 
  428.) 
  

  

  According 
  to 
  Damour, 
  this 
  mineral 
  is 
  identical 
  in 
  composition 
  with 
  

   anatase. 
  Phil. 
  Mag. 
  fy 
  Ann., 
  xxiv., 
  p. 
  477. 
  

  

  (Mineralogy 
  of 
  New- 
  York, 
  page 
  433.) 
  

  

  A 
  brown 
  mineral 
  resembling 
  sphene, 
  but 
  supposed 
  to 
  be 
  different, 
  is 
  

   said 
  to 
  have 
  been 
  found 
  in 
  Rossie, 
  St. 
  Lawrence 
  county. 
  Emmons 
  1 
  

   Rep. 
  on 
  Geol., 
  2d 
  Dist., 
  p. 
  366. 
  

  

  Sphene 
  has 
  been 
  found 
  in 
  Putnam 
  Valley, 
  Putnam 
  county, 
  by 
  Mr. 
  

   Cyrus 
  P. 
  Fountain. 
  

  

  