﻿JOURNAL 
  

  

  OF 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  

  

  Vol. 
  12 
  April 
  19, 
  1922 
  No. 
  8 
  

  

  MINERALOGY. 
  — 
  Sincosite, 
  a 
  new 
  mineral. 
  (Preliminary 
  note.)^ 
  

   Waldemar 
  T. 
  SchallEk, 
  Geological 
  Survey. 
  

   The 
  name 
  sincosite 
  is 
  given 
  to 
  a 
  green 
  hydrous 
  calcium 
  vanadyl 
  

   phosphate, 
  CaO.V2O4.P2O5.5H2O, 
  occurring 
  in 
  a 
  black 
  carbonaceous 
  

   shale 
  near 
  Sincos, 
  Peru. 
  The 
  mineral 
  forms 
  rectangular 
  plates 
  and 
  is 
  

   uniaxial 
  negative. 
  Some 
  of 
  the 
  crystals 
  are 
  biaxial. 
  Sincosite 
  be- 
  

   longs 
  to 
  the 
  uranite 
  group 
  of 
  minerals 
  (autunite, 
  torbernite, 
  carnotite, 
  

   etc.) 
  and 
  illustrates 
  the 
  unexpected 
  "equivalent 
  valency" 
  of 
  quadri- 
  

   valent 
  vanadyl 
  -vanadium 
  with 
  sexivalent 
  uranic-uranium. 
  Analysis 
  

   of 
  sincosite: 
  CaO, 
  12.1 
  (calc. 
  12.33); 
  V2O4, 
  36.3 
  (calc. 
  36.57); 
  P2O5, 
  

   31.7 
  (calc. 
  31.28); 
  HoO, 
  19.9 
  (calc. 
  19.82); 
  Insoluble, 
  0.3; 
  total, 
  100.3. 
  

   The 
  full 
  description 
  of 
  the 
  mineral 
  and 
  a 
  discussion 
  of 
  the 
  relationships 
  

   of 
  all 
  the 
  minerals 
  of 
  the 
  uranite 
  group, 
  will 
  be 
  published 
  soon. 
  

  

  MINERALOGY. 
  — 
  Cristobalite 
  from 
  the 
  Columbia 
  River 
  Basalt 
  of 
  

   Spokane, 
  Wash.- 
  Earl 
  V. 
  Shannon, 
  United 
  States 
  National 
  

   Museum. 
  

  

  Recently 
  while 
  engaged 
  in 
  studying 
  the 
  minerals 
  contained 
  in 
  

   gas 
  cavities 
  in 
  the 
  Columbia 
  River 
  Basalt 
  from 
  Spokane, 
  Washington, 
  

   the 
  writer 
  has 
  identified 
  the 
  rare 
  mineral 
  cristobalite 
  in 
  a 
  number 
  of 
  

   specimens. 
  Although 
  all 
  of 
  the 
  minerals 
  of 
  these 
  specimens 
  will 
  be 
  

   described 
  in 
  detail 
  in 
  the 
  final 
  paper, 
  to 
  be 
  published 
  in 
  the 
  Proceedings 
  

   of 
  the 
  U. 
  S. 
  National 
  Museum, 
  it 
  is 
  desired 
  here 
  to 
  call 
  attention 
  to 
  this 
  

   new 
  occurrence 
  of 
  this 
  rare 
  mineral 
  and 
  to 
  outline, 
  briefly, 
  the 
  

   mineralogic 
  features 
  of 
  the 
  locality 
  as 
  indicated 
  by 
  the 
  work 
  thus 
  

   far 
  completed. 
  The 
  specimens 
  were 
  donated 
  as 
  a 
  carefully 
  selected 
  

   series 
  to 
  the 
  Museum 
  by 
  Mr. 
  Henry 
  Fair 
  of 
  Spokane, 
  to 
  whom 
  

   grateful 
  acknowledgment 
  is 
  here 
  tendered. 
  

  

  The 
  rock 
  containing 
  the 
  minerals 
  is 
  the 
  ordinary 
  monotonous 
  basalt 
  

   of 
  the 
  vast 
  Columbia 
  River 
  lava 
  plateau 
  and 
  came 
  from 
  various 
  

   street 
  and 
  railway 
  excavations 
  in 
  the 
  City 
  of 
  Spokane. 
  The 
  rock 
  

  

  1 
  Received 
  January 
  20, 
  1922. 
  

  

  2 
  Published 
  by 
  permission 
  of 
  the 
  Secretary 
  of 
  the 
  Smithsonian 
  Institution. 
  

  

  195 
  

  

  