﻿Geology 
  and 
  Mineralogy. 
  447 
  

  

  upon 
  one 
  another 
  in 
  nearly 
  parallel 
  position 
  and 
  a 
  large 
  number 
  

   of 
  such 
  piles 
  of 
  slightly 
  divergent 
  blades 
  radiate 
  from 
  a 
  common 
  

   center 
  giving 
  rise 
  to 
  spherical 
  aggregates. 
  Perfect 
  cleavage 
  

   parallel 
  to 
  a 
  (100). 
  H. 
  = 
  3-3 
  5. 
  G. 
  = 
  215. 
  Luster 
  pearly 
  on 
  

   a, 
  vitreous 
  on 
  & 
  and 
  dull 
  on 
  d. 
  Color 
  white. 
  Ax. 
  pi. 
  || 
  5(010). 
  

   Bxae-Lc(OOl). 
  Optically 
  +. 
  a 
  = 
  1478, 
  £ 
  = 
  1479, 
  y 
  = 
  1482. 
  

   2V 
  = 
  50° 
  25'. 
  Comp. 
  — 
  A 
  zeolite 
  related 
  chemically 
  to 
  ptilolite 
  

   and 
  mordenite 
  except 
  that 
  it 
  contains 
  magnesium 
  in 
  the 
  place 
  of 
  

   calcium. 
  R 
  2 
  Al 
  2 
  (Si 
  2 
  5 
  ) 
  5 
  .6H 
  2 
  0, 
  where 
  R 
  = 
  Mg: 
  Na 
  2 
  : 
  H 
  2 
  = 
  1 
  : 
  

   1 
  : 
  1. 
  Percentage 
  composition 
  : 
  Silica 
  6742, 
  alumina 
  1146, 
  

   magnesia 
  2-99, 
  soda 
  465, 
  water 
  1348 
  = 
  100. 
  In 
  the 
  bunsen 
  

   burner 
  flame 
  whitens 
  and 
  thin 
  splinters 
  fuse 
  to 
  a 
  blebby 
  glass. 
  

   Fus. 
  = 
  3-3-5. 
  Yellow 
  flame. 
  In 
  C. 
  T. 
  whitens 
  and 
  gives 
  much 
  

   water. 
  Insoluble 
  in 
  HC1. 
  Found 
  in 
  veins 
  traversing 
  an 
  olivine- 
  

   basalt 
  along 
  a 
  cut 
  on 
  the 
  Canadian 
  Northern 
  Railway 
  on 
  

   the 
  north 
  shore 
  of 
  Kamloops 
  Lake, 
  B. 
  C. 
  Associated 
  with 
  chal- 
  

   cedony 
  and 
  calcite. 
  Named 
  in 
  honor 
  of 
  Dr. 
  W. 
  F. 
  Ferrier, 
  

   formerly 
  on 
  the 
  Canadian 
  Geological 
  Survey. 
  

  

  Hogbomite. 
  Axel 
  Gavelin, 
  (Bull. 
  Geol. 
  Inst. 
  Upsala, 
  15, 
  

   287), 
  Jour. 
  Chem. 
  Soc, 
  II, 
  324, 
  1917. 
  Hexagonal-rhombohedral. 
  

   Laminated. 
  Conchoidal 
  fracture. 
  H. 
  = 
  6-5. 
  G. 
  = 
  3-81. 
  Uni- 
  

   axial, 
  negative; 
  o> 
  = 
  1-853, 
  e 
  = 
  1-803. 
  Conrp.— 
  R0.2R 
  2 
  3 
  ; 
  RO 
  = 
  

   MgO, 
  R 
  2 
  3 
  = 
  A1 
  2 
  3 
  , 
  Fe 
  2 
  3 
  . 
  A 
  part 
  of 
  the 
  R 
  2 
  3 
  is 
  replaced 
  by 
  

   Ti0 
  2 
  . 
  Found 
  in 
  the 
  iron 
  ores 
  of 
  Ruoutevari, 
  Lapland. 
  

  

  Leifite. 
  This 
  mineral 
  was 
  briefly 
  mentioned 
  in 
  the 
  list 
  

   published 
  in 
  this 
  Journal, 
  42, 
  504, 
  1916. 
  A 
  more 
  complete 
  

   description 
  is 
  now 
  available 
  in 
  Jour. 
  Chem. 
  Soc, 
  II, 
  247, 
  1917. 
  

   Hexagonal. 
  Prismatic 
  crystals 
  without 
  terminal 
  faces. 
  Per- 
  

   fect 
  prismatic 
  cleavage. 
  H. 
  = 
  6. 
  G. 
  = 
  2-565-2-578. 
  Colorless. 
  

   Optically 
  + 
  ; 
  w 
  = 
  1-5177, 
  e 
  = 
  1-5224. 
  Comp.— 
  A 
  fluosilicate 
  of 
  

   aluminium 
  and 
  sodium, 
  Na 
  4 
  (AlF)Si 
  9 
  22 
  . 
  Easily 
  fusible 
  with 
  

   intumescence. 
  Insoluble 
  in 
  hydrochloric 
  acid. 
  Found 
  in 
  the 
  

   druses 
  of 
  the 
  pegmatite 
  of 
  Narsarsuk, 
  Greenland. 
  

  

  Oliveiraite. 
  T. 
  H. 
  Lee, 
  this 
  Journal, 
  47, 
  129, 
  1919. 
  Amor- 
  

   phous. 
  Greenish 
  yellow 
  color. 
  Comp. 
  — 
  A 
  hydrated 
  titanate 
  of 
  

   zirconium, 
  3Zr0 
  2 
  .2Ti0 
  2 
  .2H 
  2 
  0. 
  A 
  secondary 
  mineral 
  produced 
  

   by 
  the 
  alteration 
  of 
  euxenite 
  with 
  which 
  it 
  is 
  intimately 
  asso- 
  

   ciated. 
  From 
  Pomba, 
  Minas 
  Geraes, 
  Brazil. 
  Named 
  in 
  honor 
  

   of 
  the 
  Brazilian 
  geologist, 
  Dr. 
  Francisco 
  de 
  Paula 
  Oliveira. 
  

  

  Orvillite. 
  T. 
  H. 
  Lee, 
  this 
  Journal, 
  47, 
  126, 
  1919. 
  A 
  hydrous 
  

   silicate 
  of 
  zirconium 
  having 
  the 
  composition 
  8Zr0 
  2 
  .6Si0 
  2 
  .5H 
  2 
  0. 
  

   It 
  occurs 
  in 
  intimate 
  association 
  with 
  zircon, 
  lining 
  cavities 
  in 
  a 
  

   rock 
  composed 
  almost 
  wholly 
  of 
  zirconium 
  oxide 
  (baddeleyite) 
  

   from 
  the 
  Caldas 
  region, 
  Minas 
  Geraes, 
  Brazil. 
  It 
  was 
  separated 
  

   from 
  the 
  zircon 
  by 
  treatment 
  with 
  a 
  mixture 
  of 
  hydrofluoric 
  and 
  

   hydrochloric 
  acids 
  which 
  served 
  to 
  completely 
  dissolve 
  it 
  while 
  

   the 
  admixed 
  zircon 
  was 
  unattacked. 
  Named 
  in 
  honor 
  of 
  Orville 
  

   A. 
  Derby, 
  late 
  director 
  of 
  the 
  Brazilian 
  Geological 
  Survey. 
  

  

  Racewinite. 
  A. 
  N. 
  Winchell, 
  Econ. 
  Geol.. 
  13, 
  611." 
  1918. 
  

  

  