﻿H. 
  L. 
  Preston 
  — 
  Two 
  new 
  American 
  Meteorites. 
  283 
  

  

  Art. 
  XXVIII. 
  — 
  Tioo 
  new 
  American 
  Meteorites 
  ; 
  by 
  H. 
  L. 
  

  

  Preston. 
  

  

  Luis 
  Lopez, 
  New 
  Mexico. 
  

  

  The 
  Luis 
  Lopez 
  siderite 
  is 
  somewhat 
  rectangular 
  in 
  shape 
  

   and 
  measures 
  80 
  X 
  130 
  X 
  195 
  mm 
  in 
  its 
  greatest 
  diameters 
  ; 
  it 
  

   is 
  the 
  property 
  of 
  Prof. 
  Henry 
  A. 
  Ward 
  of 
  Chicago. 
  

  

  When 
  received 
  by 
  Prof. 
  Ward, 
  it 
  was 
  entire, 
  lacking 
  pos- 
  

   sibly 
  40 
  or 
  50 
  grams 
  that 
  had 
  been 
  sawn 
  off 
  one 
  of 
  the 
  promi- 
  

   nent 
  protuberances. 
  The 
  actual 
  weight 
  when 
  received 
  was 
  

   6,903 
  grams. 
  The 
  general 
  shape 
  of 
  the 
  mass 
  was 
  quite 
  sym- 
  

   metrical 
  and 
  covered 
  on 
  all 
  sides 
  with 
  large 
  and 
  prominent 
  

   pittings. 
  

  

  The 
  outer 
  surface 
  was 
  entirely 
  covered, 
  save 
  the 
  small 
  cut- 
  

   ting, 
  with 
  a 
  rather 
  lustrous 
  reddish-brown 
  crust. 
  On 
  cutting 
  

   the 
  mass, 
  numerous 
  troilite 
  nodules 
  ranging 
  in 
  size 
  from 
  

   8 
  to 
  28 
  mm 
  in 
  diameter 
  were 
  found, 
  some 
  sections 
  containing 
  as 
  

   many 
  as 
  four 
  nodules 
  of 
  large 
  size. 
  There 
  were 
  numerous 
  

   straight 
  fissures 
  one 
  millimeter 
  or 
  less 
  in 
  thickness, 
  and 
  from 
  

   -10 
  to 
  70 
  mm 
  in 
  length, 
  which 
  are 
  filled 
  with 
  troilite. 
  

  

  On 
  etching 
  the 
  surface 
  of 
  these 
  sections, 
  the 
  Widmanstatten 
  

   figures 
  are 
  brought 
  out, 
  sharp 
  and 
  distinct; 
  they 
  are 
  typically 
  

   octahedral, 
  and 
  composed 
  of 
  broad 
  laminse, 
  the 
  kamacite 
  bands 
  

   being 
  from 
  1 
  to 
  3 
  mm 
  in 
  diameter, 
  and 
  up 
  to 
  41 
  mm 
  in 
  length, 
  in 
  

   some 
  cases 
  without 
  a 
  break. 
  i 
  

  

  There 
  are 
  also 
  numerous 
  small 
  streaks 
  or 
  seams 
  of 
  schreiber- 
  

   site, 
  the 
  longest 
  as 
  far 
  as 
  observed 
  being 
  8 
  mm 
  and 
  a 
  trifle 
  less 
  

   than 
  l 
  mm 
  in 
  width. 
  

  

  The 
  troilite 
  nodules 
  are 
  likewise 
  surrounded 
  by 
  a 
  very 
  nar- 
  

   row 
  band 
  of 
  schreibersite, 
  which 
  presents 
  a 
  strong 
  contrast 
  

   between 
  the 
  silvery 
  white 
  kamacite 
  bands 
  and 
  the 
  bronze- 
  

   colored 
  troilite 
  nodules. 
  In 
  some 
  few 
  instances, 
  a 
  black 
  

   graphitic 
  substance, 
  from 
  1 
  to 
  3 
  mm 
  in 
  width, 
  is 
  seen 
  surround- 
  

   ing 
  the 
  troilite 
  nodules, 
  between 
  the 
  narrow 
  band 
  of 
  schreiber- 
  

   site 
  and 
  the 
  kamacite. 
  The 
  minute 
  hair-like 
  lines 
  commonly 
  

   called 
  laphamite 
  markings 
  are 
  abundant 
  in 
  the 
  rhomboidal 
  

   patches 
  known 
  as 
  plessite. 
  These 
  lines 
  are 
  caused 
  by 
  minute 
  

   alternating 
  layers 
  of 
  kamacite 
  and 
  tsenite, 
  plessite, 
  as 
  proved 
  

   by 
  J. 
  M. 
  Davison, 
  being 
  formed 
  in 
  this 
  way, 
  and 
  not 
  a 
  different 
  

   nickel-iron 
  alloy 
  as 
  formerly 
  supposed. 
  

  

  This 
  meteorite 
  was 
  found 
  in 
  the 
  early 
  part 
  of 
  1896 
  by 
  a 
  

   Mexican 
  named 
  Gonzales, 
  who 
  was 
  very 
  reticent 
  for 
  a 
  long 
  

   time 
  about 
  giving 
  its 
  exact 
  locality, 
  supposing 
  he 
  had 
  found 
  

   indications 
  of 
  a 
  valuable 
  mine. 
  But 
  later 
  Mr. 
  C. 
  T. 
  Brown 
  of 
  

   Socorro, 
  Xew 
  Mexico, 
  succeeded 
  in 
  obtaining 
  the 
  mass, 
  and 
  

  

  