﻿Geology 
  and 
  Mineralogy 
  . 
  81 
  

  

  fusioD. 
  Many 
  laws 
  concerning 
  the 
  formation 
  of 
  minerals 
  in 
  

   certain 
  chemical 
  compositions 
  by 
  fusion 
  are 
  announced. 
  It 
  is 
  a 
  

   work 
  -which 
  should 
  be 
  carefully 
  studied 
  by 
  every 
  petrographer, 
  

   mineralogist 
  and 
  mineral 
  chemist. 
  l. 
  v. 
  p. 
  

  

  7. 
  Kyshtymlte 
  and 
  G 
  or 
  uadiim- 
  Syenite. 
  — 
  In 
  the 
  work 
  men- 
  

   tioned 
  above 
  Morozewicz 
  describes 
  massive 
  rocks 
  from 
  various 
  

   localities 
  in 
  the 
  Urals 
  containing 
  corundum. 
  Sc»me 
  of 
  these 
  are 
  

   corundum-syenites 
  consisting 
  mainly 
  of 
  orthoclase, 
  biotite 
  and 
  

   corundum 
  — 
  the 
  latter 
  playing 
  the 
  function 
  of 
  quartz 
  in 
  a 
  granite. 
  

   Some 
  are 
  pegmatitic 
  in 
  character, 
  the 
  well-formed 
  corundum 
  crys- 
  

   tals 
  surrounded 
  by 
  orthoclase. 
  Such 
  occurrences 
  must 
  resemble 
  

   the 
  corundum-syenites 
  of 
  Ontario 
  which 
  have 
  recently 
  attracted 
  

   much 
  attention. 
  Corundum-syenite-pegmatite 
  occurs 
  also 
  in 
  

   Montana 
  at 
  an 
  undescribed 
  locality, 
  while 
  Mallet 
  in 
  a 
  recent 
  

   work 
  (Records 
  Geol. 
  Sarv. 
  India) 
  describes 
  instances 
  of 
  corundum 
  

   in 
  syenitic 
  rocks 
  as 
  well 
  as 
  basic 
  ones, 
  and 
  these 
  latter 
  recall 
  the 
  

   North 
  Carolina 
  localities. 
  The 
  occurrence 
  of 
  corundum 
  as 
  an 
  im- 
  

   portant 
  constituent 
  of 
  igneous 
  rocks 
  is 
  now 
  not 
  only 
  v^ell 
  confirmed 
  

   but 
  proving 
  not 
  uncommon. 
  

  

  Morozewicz 
  describes 
  also 
  from 
  the 
  Urals 
  rocks 
  which 
  consist 
  of 
  

   corundum 
  and 
  biotite 
  with 
  some 
  zircon 
  and 
  spinel 
  and 
  of 
  granitic 
  

   structure. 
  The 
  alkali 
  feldspars 
  are 
  here 
  replaced 
  by 
  plagioclase 
  

   and 
  for 
  these 
  plagioclase-corundum 
  rocks 
  he 
  proposes 
  the 
  name 
  

   of 
  Kyshtymite. 
  It 
  is 
  the 
  source 
  of 
  the 
  disputed 
  barsowite 
  of 
  

   Rose, 
  which 
  is 
  here 
  shown 
  to 
  be 
  anorthite. 
  l. 
  v. 
  p. 
  

  

  8. 
  Le 
  Gahbro 
  du 
  P(dlet 
  et 
  ses 
  Modifications, 
  by 
  A. 
  Lacroix. 
  

   Bull, 
  des 
  services 
  Carte 
  geol. 
  de 
  France, 
  No. 
  67, 
  vol. 
  x, 
  1899, 
  8°, 
  

   pp 
  56, 
  Paris. 
  — 
  The 
  author 
  in 
  this 
  work 
  describes 
  a 
  massif 
  of 
  

   gabbro 
  surrounded 
  by 
  mica 
  schists. 
  It 
  is 
  formed 
  in 
  the 
  main 
  of 
  

   an 
  oliviue-gabbro 
  with 
  labradorite 
  which 
  passes 
  gradually 
  into 
  

   norite 
  with 
  andesine 
  and 
  cordierite, 
  especially 
  at 
  the 
  borders. 
  It 
  

   is 
  cut 
  by 
  numerous 
  dikes 
  whose 
  rocks 
  recall 
  those 
  associated 
  with 
  

   the 
  gabbros 
  of 
  the 
  Odenwald. 
  The 
  chief 
  interest 
  centers 
  in 
  the 
  

   origin 
  of 
  the 
  norite 
  witli 
  cordierite 
  and 
  garnet, 
  and 
  this 
  is 
  believed 
  

   to 
  be 
  the 
  result 
  of 
  the 
  normal 
  gabbro 
  coming 
  in 
  contact 
  with 
  the 
  

   mica 
  schists 
  and 
  absorbing 
  them 
  in 
  quantity 
  with 
  consequent 
  

   change 
  in 
  chemical 
  composition 
  and 
  production 
  of 
  a 
  different 
  

   mineralogical 
  type. 
  l. 
  v. 
  p. 
  

  

  9. 
  Steinbruchindustrie 
  und 
  Stelnhruchgeologie 
  ; 
  by 
  O. 
  Herr- 
  

   mann. 
  8°, 
  pp. 
  428, 
  pi. 
  7. 
  Berlin, 
  1899. 
  — 
  This 
  work, 
  which 
  is 
  

   written 
  for 
  those 
  using 
  stone 
  in 
  technical 
  ways 
  such 
  as 
  quarry- 
  

   men, 
  architects, 
  engineers, 
  etc., 
  gives 
  in 
  a 
  rather 
  simple 
  and 
  ele- 
  

   mentary 
  manner 
  a 
  description 
  ot 
  the 
  chief 
  rock-making 
  minerals 
  

   followed 
  by 
  an 
  account 
  of 
  the 
  most 
  important 
  rocks 
  from 
  a 
  tech- 
  

   nical 
  standpoint, 
  the 
  descriptions 
  and 
  classification 
  being 
  based 
  

   on 
  Zirkel's 
  manual. 
  A 
  considerable 
  amount 
  of 
  geology 
  relating 
  

   to 
  the 
  subject 
  is 
  incorporated. 
  This 
  is 
  followed 
  by 
  a 
  description 
  

   of 
  the 
  tools 
  and 
  methods 
  of 
  quarrying 
  and 
  working 
  stone. 
  

  

  The 
  succeeding 
  and 
  larger 
  part 
  of 
  the 
  volume 
  is 
  devoted 
  to 
  a 
  

  

  Am. 
  Jour. 
  Sci. 
  — 
  Fourth 
  Series, 
  Yol. 
  VIII, 
  No. 
  43. 
  — 
  July, 
  1899. 
  

   G 
  

  

  