﻿478 
  /Scientific 
  Intelligence. 
  

  

  facts 
  believes 
  that 
  a 
  certain 
  number 
  of 
  definite 
  mineral 
  species 
  of 
  

   intermediate 
  nature 
  exist 
  between 
  the 
  extremes. 
  They 
  thus 
  

   constitute 
  in 
  fact 
  a 
  " 
  morphotropic 
  " 
  series, 
  whose 
  gradation 
  of 
  

   properties 
  would 
  lead 
  to 
  the 
  same 
  practical 
  results 
  as 
  the 
  views 
  

   now 
  generally 
  held 
  but 
  which 
  would 
  be 
  more 
  in 
  accord 
  with 
  

   chemical 
  principles. 
  l. 
  v. 
  p. 
  

  

  8. 
  Analcite- 
  Diabase 
  from 
  San 
  Luis, 
  Obispo 
  Co., 
  Gal. 
  ; 
  by 
  H. 
  

   W. 
  Fairbanks. 
  Bull. 
  Dept. 
  Geol. 
  Univ. 
  of 
  Cal., 
  vol. 
  i, 
  No. 
  9, 
  

   pp. 
  273-300, 
  Pis. 
  15-16. 
  Berkeley, 
  Cal., 
  1895.— 
  This 
  is 
  a 
  careful 
  

   study 
  both 
  in 
  the 
  field 
  and 
  laboratory 
  of 
  a 
  number 
  of 
  peculiar 
  

   basic 
  dike 
  rocks, 
  which 
  are 
  allied 
  to 
  teschenites. 
  They 
  contain 
  

   augite 
  with 
  a 
  peculiar 
  parting, 
  a 
  soda-lime 
  feldspar 
  and 
  a 
  con- 
  

   siderable 
  proportion 
  of 
  analcite 
  which 
  occurs 
  crystallized 
  and 
  

   lining 
  cavities 
  in 
  the 
  rock, 
  filling 
  angular 
  spaces 
  between 
  other 
  

   components, 
  replacing 
  feldspar 
  and 
  in 
  hexagons. 
  The 
  occurrence 
  

   of 
  the 
  analcite 
  is 
  studied 
  and 
  discussed 
  and 
  the 
  conclusion 
  is 
  

   drawn 
  that 
  it 
  is 
  secondary, 
  replacing 
  nephelite 
  which 
  was 
  pri 
  

   marily 
  present. 
  l. 
  v. 
  p. 
  

  

  9. 
  Gold 
  in 
  Serpentine 
  ; 
  by 
  H. 
  W. 
  Turner 
  (communicated). 
  

   — 
  In 
  an 
  article 
  by 
  the 
  writer 
  in 
  the 
  May 
  number 
  of 
  this 
  Journal, 
  

   it 
  is 
  stated 
  that 
  quartz 
  veins 
  are 
  rare 
  in 
  the 
  serpentine 
  areas 
  of 
  

   the 
  Sierra 
  Nevada. 
  Mr. 
  W. 
  Lindgren 
  in 
  a 
  valuable 
  paper 
  on 
  

   " 
  Characteristic 
  Features 
  of 
  the 
  California 
  Gold-Quartz 
  Veins"* 
  

   speaks 
  of 
  the 
  occurrence 
  of 
  quartz 
  veins 
  in 
  serpentine 
  as 
  an 
  ordi- 
  

   nary 
  phenomenon, 
  and 
  as 
  Mr. 
  Lindgren 
  and 
  the 
  writer 
  are 
  both 
  

   working 
  in 
  the 
  same 
  mountain 
  range, 
  it 
  would 
  appear 
  as 
  if 
  there 
  

   were 
  an 
  error 
  in 
  one 
  of 
  the 
  above 
  papers. 
  The 
  writer 
  therefore 
  

   desires 
  to 
  state 
  that 
  the 
  occurrence 
  of 
  quartz 
  veins 
  along 
  narrow 
  

   serpentine 
  dikes, 
  or 
  cutting 
  small 
  bodies 
  of 
  serpentine, 
  is 
  not 
  

   uncommon. 
  Mr. 
  Lindgren 
  has 
  made 
  a 
  careful 
  study 
  of 
  the 
  gold 
  

   mines 
  in 
  the 
  neighborhood 
  of 
  Nevada 
  City, 
  Cala., 
  and 
  he 
  has 
  

   there 
  found 
  several 
  quartz 
  veins 
  entirely 
  in 
  serpentine, 
  but 
  these 
  

   are 
  in 
  comparatively 
  small 
  masses 
  of 
  that 
  rock 
  which 
  moreover 
  

   contain 
  lenses 
  of 
  sedimentary 
  material 
  and 
  are 
  therefore 
  of 
  a 
  

   more 
  or 
  less 
  complex 
  character. 
  It 
  was 
  the 
  intention 
  of 
  the 
  

   writer 
  rather 
  to 
  indicate 
  that 
  quartz-filled 
  fissures 
  formed 
  with 
  

   difficulty 
  where 
  the 
  country 
  rock 
  is 
  purely 
  serpentine, 
  and 
  in 
  this 
  

   statement 
  Mr. 
  Lindgren 
  concurs. 
  The 
  writer's 
  observations 
  in 
  

   the 
  paper 
  in 
  the 
  May 
  number 
  of 
  the 
  Journal 
  moreover 
  refer 
  only 
  

   to 
  that 
  portion 
  of 
  the 
  range 
  which 
  he 
  has 
  particularly 
  studied. 
  

  

  1 
  0. 
  Brief 
  Notices 
  of 
  some 
  recently 
  described 
  Minerals. 
  — 
  Loran- 
  

   dite. 
  — 
  This 
  is 
  a 
  mineral 
  of 
  rare 
  interest 
  since 
  it 
  is 
  the 
  second 
  

   known 
  native 
  compound 
  of 
  thallium. 
  A 
  preliminary 
  description 
  

   has 
  been 
  giving 
  by 
  Krenner. 
  It 
  occurs 
  in 
  tabular 
  or 
  short 
  pris- 
  

   matic 
  crystals 
  belonging 
  to 
  the 
  monoclinic 
  system. 
  The 
  color 
  is 
  

   cochineal-red 
  to 
  kermes-red 
  color 
  ; 
  it 
  is 
  transparent 
  and 
  is 
  flexible 
  

   like 
  gypsum, 
  and 
  has 
  three 
  cleavages 
  parallel 
  to 
  planes 
  in 
  the 
  

   orthodome 
  zone. 
  An 
  analysis 
  by 
  Loczka 
  is 
  given 
  below 
  (1) 
  and 
  

  

  *Bull. 
  Geol. 
  Soc. 
  Am., 
  vol. 
  vi, 
  pp. 
  221-240. 
  

  

  