﻿92 
  

  

  Thirtieth 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  feldspathic 
  matrix. 
  The 
  composition 
  of 
  this 
  variety 
  is 
  given 
  

   under 
  B. 
  

  

  A. 
  B. 
  

  

  Specific 
  Gravity 
  2.72 
  2.70 
  

  

  Silica 
  54.47 
  

  

  Titanic 
  Acid 
  nndet. 
  

  

  Alumina 
  

  

  Ferric 
  Oxide 
  . 
  . 
  

   Ferrous 
  Oxide 
  

  

  Lime 
  

  

  Magnesia 
  

  

  Potassa 
  

  

  Soda 
  , 
  

  

  Water 
  

  

  26.45 
  

   1.297 
  

   0.665 
  

  

  10.80 
  

   0.69 
  

   0.92 
  

   4.37 
  

   0.53 
  

  

  100.192 
  

  

  Computation 
  of 
  Analysis 
  A. 
  

  

  Eadicals. 
  

  

  Silicon 
  25.42 
  

  

  Aluminum 
  (Al) 
  14 
  . 
  07 
  

   Ferricurn 
  (Fe) 
  

   Ferrosum 
  . 
  

   Calcium 
  . 
  . 
  

   Magnesium 
  

   Potassium 
  

   Sodium 
  . 
  . 
  . 
  

  

  0.9079 
  

  

  0.5172 
  

  

  7.714 
  

  

  0.415 
  

  

  0.764 
  

  

  3.242 
  

  

  Atoms. 
  

  

  0.9079 
  

   0.2577 
  

   0.0081 
  

   0.0092 
  

   0.1928 
  

   0.0173 
  

   0.0195 
  

   0.1410 
  

  

  Quantivalents. 
  

  

  3.6316 
  3.6316 
  

  

  1 
  .5462 
  

   0.0486 
  

   0.0184 
  

   0.3856 
  

   0.0346 
  

   0.0195 
  

   0.1410 
  

  

  1.5948 
  

  

  0.5991 
  

  

  54.62 
  

   undet. 
  

   26.50 
  

   0.757 
  

   0.565 
  

   9.88 
  

   0.74 
  

   1.23 
  

   4.50 
  

   0.91 
  

  

  99.702 
  

  

  Ratio. 
  

  

  6.83 
  

  

  1.13 
  

  

  The 
  quotients 
  obtained 
  by 
  dividing 
  the 
  percentages 
  of 
  the 
  

   radicals 
  by 
  their 
  atomic 
  weights, 
  are 
  here 
  employed 
  to 
  express 
  

   the 
  relative 
  number 
  of 
  atoms 
  of 
  these 
  radicals 
  present 
  in 
  the 
  

   compound, 
  and 
  the 
  relation 
  existing 
  between 
  these 
  numbers 
  is 
  

   called 
  the 
  Atomic 
  Ratio. 
  The 
  products 
  formed 
  by 
  multiplying 
  

   the 
  atoms 
  by 
  the 
  quantivalences, 
  which 
  they 
  possess 
  in 
  the 
  

   particular 
  combination 
  under 
  consideration, 
  have 
  been 
  termed 
  

   above 
  Quantivalents. 
  Similarly, 
  the 
  ratio 
  between 
  these 
  pro- 
  

   ducts 
  might 
  be 
  called 
  the 
  Quantivalent 
  Ratio. 
  The 
  latter 
  has 
  

   in 
  some 
  places 
  been 
  called 
  the 
  Atomic 
  Ratio, 
  but 
  this 
  term 
  may 
  

   with 
  greater 
  propriety 
  be 
  restricted 
  to 
  the 
  first. 
  The 
  products 
  

   themselves, 
  for 
  distinction's 
  sake, 
  are 
  styled 
  Quantivalents. 
  

   This 
  term 
  is 
  open 
  to 
  objection, 
  on 
  account 
  of 
  the 
  close 
  similarity 
  

  

  