﻿Geology 
  and 
  Mineralogy. 
  8S 
  

  

  Before 
  the 
  blowpipe 
  it 
  fuses 
  with 
  difficulty 
  to 
  a 
  cloudy 
  glass, 
  

   giving 
  a 
  red 
  calcium 
  flame 
  ; 
  on 
  charcoal 
  it 
  glows 
  and 
  yields 
  a 
  

   sublimate 
  of 
  zinc 
  oxide 
  ; 
  gelatinizes 
  easily 
  with 
  hydrochloric 
  

   acid. 
  Obtained 
  from 
  the 
  North 
  Hill 
  mine 
  at 
  Franklin, 
  where 
  it 
  

   occurs 
  in 
  a 
  fine 
  granular 
  banded 
  ore 
  associated 
  with 
  willemite, 
  

   rhodonite 
  and 
  franklinite. 
  Named 
  from 
  the 
  township 
  in 
  which 
  

   the 
  locality 
  is 
  situated. 
  — 
  Proo. 
  Amer. 
  Acad. 
  ScL, 
  xxxiv, 
  479, 
  

   1899. 
  

  

  Carnotite 
  is 
  a 
  vanadate 
  of 
  potassium 
  and 
  uranium 
  described 
  by 
  

   C. 
  Friedel 
  and 
  E. 
  Cumenge. 
  It 
  occurs 
  as 
  a 
  yellow 
  crystalline 
  

   powder, 
  or 
  in 
  loosely 
  cohering 
  masses, 
  easily 
  separated 
  by 
  the 
  

   fingers; 
  it 
  is 
  intimately 
  mixed 
  with 
  a 
  quartzose 
  sand. 
  The 
  

   formula 
  given 
  for 
  it 
  is 
  K.^O. 
  21120^. 
  V^O^.SH.^^O, 
  deduced 
  from 
  the 
  

   following 
  analyses 
  (after 
  the 
  separation 
  of 
  silica) 
  of 
  air-dried 
  

   material 
  : 
  

  

  V205 
  

  

  U.O3 
  

  

  K2O 
  

  

  H2O 
  

  

  

  20-12 
  

  

  63-54 
  

  

  10-37 
  

  

  5-95 
  

  

  = 
  99-98 
  

  

  20-31 
  

  

  64-70 
  

  

  10-97 
  

  

  5-19 
  

  

  re.203 
  0-96 
  

  

  19-95 
  

  

  62-46 
  

  

  11-15 
  

  

  — 
  

  

  FesOs 
  0-65 
  

  

  102-13 
  

  

  Occurs 
  in 
  Montrose 
  Co., 
  Colorado, 
  in 
  cavities 
  or 
  associated 
  with 
  

   malachite 
  and 
  azurite. 
  Some 
  samples 
  show 
  60 
  p.c. 
  of 
  SiO.^, 
  

   the 
  purest 
  2-6 
  to 
  7*2 
  p.c; 
  separation 
  is 
  accomplished 
  by 
  nitric 
  

   acid. 
  Named 
  after 
  M. 
  Adolphe 
  Carnot. 
  — 
  Comptes 
  Jlendus, 
  

   cxxviii, 
  532, 
  1899. 
  

  

  PHiLirsTADiTE 
  is 
  a 
  variety 
  of 
  amphibole 
  named 
  by 
  R. 
  A. 
  Daly, 
  

   and 
  identified 
  by 
  him 
  in 
  the 
  course 
  of 
  an 
  investigation 
  of 
  the 
  

   etching 
  figures 
  of 
  the 
  amphiboles, 
  which 
  is 
  referred 
  to 
  in 
  another 
  

   paragraph 
  (p. 
  82). 
  The 
  locality 
  is 
  Philipstad, 
  Sweden. 
  It 
  shows 
  

   anomalous 
  etching 
  figures 
  on 
  m 
  (110) 
  and 
  Z> 
  (010) 
  ; 
  pronounced 
  

   zonal 
  structure 
  ; 
  small 
  optic 
  axial 
  angle 
  (about 
  50°) 
  ; 
  also 
  unusual 
  

   pleochroism 
  and 
  absorption: 
  viz., 
  it 
  light, 
  brownish 
  green, 
  \y 
  dark 
  

   yellow-green, 
  c 
  dark 
  blue-green 
  ; 
  b 
  ^ 
  C 
  ^ 
  it- 
  It 
  is 
  optically 
  — 
  , 
  

   with 
  an 
  extinction-angle 
  on 
  5(010) 
  with 
  e' 
  = 
  + 
  15° 
  9' 
  (Na). 
  An 
  

   analysis 
  by 
  Pisani 
  gave 
  : 
  

  

  SiO, 
  TiOa 
  AI2O3 
  Fe^Oa 
  FeO 
  MnO 
  CaO 
  MgO 
  Na.^O 
  K2O 
  ign. 
  

  

  45-20 
  0-84 
  7-34 
  7-55 
  15-80 
  1-52 
  12-30 
  8-40 
  0-80 
  037 
  0-70 
  = 
  10082 
  

  

  — 
  Proc. 
  Amer. 
  Acad. 
  tSei., 
  xxxiv, 
  433, 
  1899. 
  

  

  Federovite 
  is 
  a 
  pyroxene, 
  intermediate 
  between 
  regirite- 
  

   augite 
  and 
  a^girite. 
  It 
  is 
  named 
  by 
  Viola 
  in 
  a 
  petrographical 
  

   article 
  on 
  rocks 
  from 
  the 
  province 
  of 
  Rome, 
  Italy, 
  in 
  which 
  the 
  

   author 
  makes 
  an 
  extended 
  study 
  of 
  the 
  optical 
  properties 
  of 
  the 
  

   pyroxenes. 
  In 
  this 
  he 
  shows 
  that 
  they 
  may 
  be 
  classified 
  into 
  

   groups 
  according 
  to 
  the 
  angle, 
  c 
  ^ 
  c 
  which 
  angle 
  increases 
  with 
  

   increasing 
  soda 
  and 
  iron. 
  Of 
  those 
  in 
  which 
  c 
  /s, 
  c 
  =■ 
  50°-56° 
  and 
  

   2V 
  = 
  50° 
  are 
  called 
  aegirite-augite, 
  he 
  thinks 
  that 
  those 
  in 
  which 
  

   c 
  /\ 
  c 
  = 
  65°-75° 
  and 
  2V 
  = 
  50° 
  should 
  have 
  a 
  separate 
  name. 
  

   Such 
  a 
  variety 
  would 
  contain 
  from 
  9-13^ 
  alkali, 
  about 
  24^ 
  iron 
  

   oxide 
  and 
  strong 
  pleochroism 
  c 
  = 
  yellow, 
  ^ 
  = 
  ^ 
  = 
  olive 
  green. 
  

   The 
  name 
  given 
  above, 
  which 
  is 
  proposed 
  for 
  this 
  variety, 
  is 
  given 
  

   after 
  the 
  Russian 
  petrographer 
  E. 
  von 
  Federov. 
  — 
  Jahrh. 
  f. 
  3Iin.^ 
  

   i, 
  120, 
  1899. 
  

  

  