﻿348 
  Penfield 
  and 
  Warren 
  — 
  Minerals 
  froin 
  Franklin, 
  N. 
  J. 
  

  

  and 
  globules 
  of 
  metallic 
  lead. 
  The 
  mineral 
  is 
  readily 
  soluble 
  

   in 
  dilute 
  nitric 
  acid, 
  and 
  the 
  solution 
  yields 
  gelatinous 
  silica 
  

   upon 
  evaporation. 
  

  

  The 
  mineral 
  is 
  named 
  after 
  Mr. 
  Frank 
  L. 
  Nason 
  of 
  West 
  

   Haven, 
  Connecticut, 
  formerly 
  of 
  the 
  Geological 
  Survey 
  of 
  the 
  

   State 
  of 
  New 
  Jersey. 
  

  

  Note 
  concerning 
  the 
  Chemical 
  Composition 
  of 
  Ga^^omalite. 
  

  

  Nasonite 
  is 
  closely 
  related 
  to 
  ganomalite, 
  to 
  which 
  the 
  em- 
  

   pirical 
  formula 
  PbgCa^SigOu 
  has 
  been 
  assigned, 
  a 
  little 
  calcium 
  

   being 
  replaced 
  by 
  manganese. 
  The 
  foregoing 
  formula, 
  when 
  

   doubled, 
  may 
  be 
  written 
  as 
  a 
  slightly 
  basic 
  salt, 
  as 
  follows 
  : 
  

   Pb4(Pb20)^'Ca4(Si20,)3, 
  which 
  is 
  like 
  the 
  formula 
  of 
  nasonite, 
  

   except 
  that 
  the 
  bivalent 
  basic 
  lead 
  oxide 
  radical 
  (Pb20) 
  of 
  

   ganomalite 
  takes 
  the 
  place 
  of 
  the 
  two 
  univalent 
  lead 
  chloride 
  

   radicals 
  (PbCl) 
  of 
  nasonite. 
  The 
  analogy 
  between 
  the 
  two 
  

   minerals, 
  however, 
  becomes 
  still 
  closer 
  if 
  two 
  univalent 
  lead 
  

   hydroxide 
  radicals 
  (PbOH) 
  are 
  substituted 
  for 
  the 
  bivalent 
  

   basic 
  lead 
  oxide 
  radical 
  as 
  follows 
  : 
  Pb4(PbOH)2Ca2(Si20.)3, 
  and 
  

   v^e 
  hope 
  to 
  be 
  able 
  to 
  show 
  that 
  this 
  is 
  undoubtedly 
  the 
  correct 
  

   formula 
  for 
  ganomalite. 
  The 
  amount 
  of 
  water 
  necessary 
  to 
  yield 
  

   two 
  hydroxyls 
  in 
  the 
  complex 
  ganomalite 
  molecule 
  is 
  a 
  trifle 
  

   less 
  than 
  one 
  per 
  cent, 
  a 
  quantity 
  which 
  might 
  have 
  been 
  easily 
  

   overlooked. 
  In 
  two 
  analyses 
  of 
  ganomalite 
  from 
  Jakobsberg, 
  

   Sweden, 
  by 
  Wiborgh, 
  quoted 
  by 
  Sjogren,^* 
  neither 
  water 
  nor 
  

   loss 
  on 
  ignition 
  are 
  recorded, 
  while 
  in 
  an 
  analysis 
  by 
  Lind- 
  

   stromf 
  a 
  loss 
  on 
  ignition 
  of 
  0*57 
  per 
  cent 
  is 
  given, 
  and, 
  what 
  

   is 
  also 
  very 
  significant, 
  the 
  presence 
  of 
  a 
  little 
  chlorine 
  is 
  

   recorded. 
  Lindstrom's 
  analysis 
  is 
  as 
  follows 
  : 
  

  

  Theory 
  for 
  

   Pb4(PbOH)oCa4(Si20T)3 
  

  

  18.56 
  

   68-97 
  

   11-55 
  

  

  -92 
  

  

  

  

  

  

  Analysis 
  

  

  

  Analysis. 
  

  

  Ratio. 
  

  

  

  recalcu- 
  

   lated. 
  

  

  SiO, 
  

  

  18-33 
  

  

  •306 
  

  

  3^00 
  

  

  SiO, 
  18-51 
  

  

  PbO 
  

  

  68-80 
  

  

  •308 
  

  

  3^02 
  

  

  PbO 
  69-46 
  

  

  MnO 
  

  

  2-29 
  

  

  •032 
  ) 
  

  

  

  CaO 
  11-40 
  

  

  MgO 
  

  

  •11 
  

  

  -003 
  \ 
  -202 
  

  

  ^98 
  

  

  H,0 
  -63 
  

  

  CaO 
  

  

  9-34 
  

  

  •167 
  ) 
  

  

  

  

  

  CI 
  

   Ign. 
  

  

  •24 
  

  

  •57-^ 
  

  

  -.JoVA-^^ 
  

  

  0^70 
  

  

  100-00 
  

  

  IX 
  

  

  •35 
  

  

  

  

  

  100-00 
  

  

  100^03 
  

  

  The 
  ratio 
  of 
  SiO, 
  : 
  PbO 
  : 
  CaO 
  : 
  (OH 
  + 
  C1) 
  = 
  3^00 
  : 
  3-02 
  : 
  1^98 
  : 
  

   O^TO 
  or, 
  excepting 
  the 
  liydroxyl 
  and 
  chlorine, 
  a 
  very 
  close 
  approx- 
  

   imation 
  to 
  3 
  : 
  3 
  : 
  2 
  : 
  1, 
  thus 
  agreeing 
  \vith 
  the 
  ratio 
  of 
  nasonite. 
  

  

  * 
  Geol. 
  For. 
  Forhandl, 
  vi, 
  p. 
  537, 
  1883. 
  f 
  I^i^^ 
  P- 
  663. 
  

  

  X 
  X=:CuO 
  0-02, 
  AI0O3 
  007, 
  FeaOa 
  0-12, 
  alkali 
  0-1.0, 
  PaOs 
  004. 
  

  

  