﻿Penfield 
  and 
  Warren 
  — 
  Minerals 
  from 
  Franhlin^ 
  N. 
  J. 
  351 
  

  

  4. 
  Leucophcen^icite. 
  

  

  This 
  mineral 
  made 
  op 
  the 
  larger 
  part 
  of 
  a 
  specimen 
  about 
  

   two 
  inches 
  in 
  length 
  and 
  breadth 
  by 
  one 
  inch 
  in 
  thickness, 
  

   which 
  was 
  found 
  by 
  Mr. 
  J. 
  J. 
  McGovern 
  of 
  Franklin, 
  and 
  

   given 
  to 
  C. 
  H. 
  Warren 
  in 
  1897. 
  It 
  has 
  also 
  been 
  observed 
  in 
  

   small 
  amount 
  on 
  a 
  few 
  specimens 
  sent 
  to 
  us 
  by 
  Mr. 
  W. 
  M. 
  

   Foote. 
  The 
  mineral 
  has 
  a 
  crystalline 
  structure, 
  vitreous 
  luster, 
  

   hardness 
  about 
  5*5-6, 
  and 
  is 
  conspicuous 
  on 
  account 
  of 
  its 
  light 
  

   purplish-red 
  or 
  raspberry 
  color. 
  It 
  was 
  supposed 
  at 
  first 
  to 
  be 
  

   clinohedrite, 
  rather 
  deeply 
  colored 
  by 
  manganese. 
  It 
  is 
  inti- 
  

   mately 
  associated 
  with 
  willemite 
  of 
  almost 
  gem-like 
  quality 
  

   and 
  beautiful 
  light 
  green 
  color, 
  and 
  with 
  small 
  idiomorphic 
  

   crystals 
  of 
  brown 
  vesuvianite, 
  showing 
  prisms 
  of 
  the 
  first 
  and 
  

   second 
  order, 
  pyramid 
  of 
  the 
  first 
  order 
  and 
  base. 
  Occasional 
  

   crystal 
  faces 
  were 
  observed 
  on 
  the 
  leucophoenicite, 
  but 
  none 
  

   which 
  gave 
  any 
  clue 
  to 
  the 
  system 
  of 
  crystallization. 
  

  

  When 
  small 
  fragments 
  of 
  the 
  mineral 
  are 
  imbedded 
  in 
  

   balsam 
  and 
  examined 
  with 
  the 
  microscope 
  it 
  may 
  be 
  seen 
  that 
  

   the 
  fragments 
  are 
  mostly 
  irregular, 
  although 
  some 
  are 
  flat 
  and 
  

   appear 
  to 
  lie 
  upon 
  imperfect 
  cleavage 
  faces. 
  There 
  also 
  may 
  

   be 
  seen 
  irregular 
  cracks 
  indicating 
  a 
  second 
  but 
  not 
  distinct 
  

   cleavage. 
  In 
  polarized 
  light 
  the 
  extinction 
  seemed 
  to 
  be 
  

   slightly 
  inclined 
  to 
  the 
  direction 
  of 
  the 
  second 
  cleavage, 
  and 
  in 
  

   convergent 
  light 
  an 
  optical 
  axis 
  was 
  observed 
  near 
  the 
  limit 
  of 
  

   the 
  field. 
  The 
  fragments 
  showed 
  a 
  slight 
  pleochroism, 
  pale 
  

   rose 
  for 
  vibrations 
  parallel 
  to 
  the 
  direction 
  of 
  cleavage, 
  and 
  

   colorless 
  at 
  right 
  angles 
  to 
  this 
  direction. 
  These 
  properties 
  

   indicate 
  that 
  the 
  material 
  probably 
  crystallizes 
  in 
  one 
  of 
  the 
  

   inclined 
  systems, 
  although 
  wholly 
  satisfactory 
  conclusions 
  

   could 
  not 
  be 
  drawn. 
  

  

  Yery 
  pure 
  material 
  for 
  the 
  chemical 
  analysis 
  was 
  obtained 
  

   by 
  crushing 
  a 
  portion 
  of 
  the 
  best 
  specimen, 
  and 
  selecting 
  the 
  

   purest 
  particles 
  by 
  hand. 
  The 
  specific 
  gravity 
  was 
  found 
  to 
  

   be 
  S'SIS. 
  The 
  results 
  of 
  the 
  analysis 
  by 
  Warren 
  are 
  as 
  

   follows 
  : 
  

  

  

  

  I. 
  

  

  II. 
  

  

  Average. 
  

  

  

  Ratio. 
  

  

  

  SiO, 
  

  

  

  26-31 
  

  

  26-41 
  

  

  26-36 
  

  

  •439 
  

  

  3 
  03 
  

  

  MnO 
  

  

  

  60-59 
  

  

  60-67 
  

  

  60-63 
  

  

  •854 
  ] 
  

  

  

  

  ZnO 
  

  

  

  

  4-03 
  

  

  3-72 
  

  

  3-87 
  

  

  •047 
  

  

  

  

  FeO 
  .... 
  

  

  

  

  

  

  

  trace 
  

  

  

  

  

  

  MgO.... 
  

  

  

  0-21 
  

  

  

  

  0-21 
  

  

  •005 
  

  

  >1-015 
  

  

  7-00 
  

  

  CaO 
  .... 
  

  

  

  5-64 
  

  

  5-70 
  

  

  5-67 
  

  

  •101 
  

  

  

  

  Na,0 
  .... 
  

  

  

  

  0-39 
  

  

  

  

  0-39 
  

  

  •006 
  

  

  

  

  KG 
  

  

  

  0-24 
  

   2-VO 
  

  

  2-58 
  

  

  0-24 
  

   2-64 
  

  

  •002 
  

  

  

  

  2 
  

  

  HO 
  - 
  

  

  

  '146 
  

  

  1^01 
  

  

  a.^2^ 
  

  

  

  

  

  100-01 
  

  

  

  Am. 
  Jour. 
  

  

  Sci.- 
  

  

  —Fourth 
  Series, 
  Yol 
  

  

  . 
  YIII, 
  No. 
  

  

  47.— 
  November, 
  

  

  1898. 
  

  

  

  24 
  

  

  

  

  

  

  

  

  