﻿Ne 
  

  

  Kp* 
  

  

  condition 
  

  

  ature 
  

  

  Time 
  

  

  95 
  

  

  5 
  

  

  crystalline 
  

  

  1276 
  

  

  1 
  hr. 
  

  

  tt 
  

  

  a 
  

  

  a 
  

  

  1282 
  

  

  a 
  

  

  90 
  

  

  10 
  

  

  u 
  

  

  1302 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  1306 
  

  

  a 
  

  

  85 
  

  

  15 
  

  

  a 
  

  

  1322 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  u 
  

  

  1327 
  

  

  a 
  

  

  80 
  

  

  20 
  

  

  a 
  

  

  1345 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  1350 
  

  

  a 
  

  

  75 
  

  

  25 
  

  

  a 
  

  

  1366 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  1370 
  

  

  tt 
  

  

  70 
  

  

  30 
  

  

  cc 
  

  

  1384 
  

  

  a 
  

  

  ii 
  

  

  u 
  

  

  a 
  

  

  1388 
  

  

  a 
  

  

  JV. 
  L. 
  Bowen 
  — 
  Sodium-Potassium 
  Nephelites. 
  121 
  

  

  Table 
  I. 
  

  

  Beginning 
  of 
  inversion 
  of 
  nephelite 
  to 
  carnegieite. 
  

  

  Composition 
  Initial 
  Temper- 
  

  

  Kesult 
  

  

  hr. 
  hexagonal 
  form 
  persists 
  unchange 
  d 
  

   trace 
  of 
  carnegieite 
  formed 
  

   hexagonal 
  form 
  unchanged 
  

   trace 
  of 
  carnegieite 
  

   hexagonal 
  form 
  unchanged 
  

   trace 
  of 
  carnegieite 
  

   hexagonal 
  form 
  unchanged 
  

   trace 
  of 
  carnegieite 
  

   hexagonal 
  form 
  unchanged 
  

   trace 
  of 
  carnegieite 
  

   hexagonal 
  form 
  unchanged 
  

   trace 
  of 
  carnegieite 
  

  

  Completion 
  of 
  inversion 
  of 
  nephelite 
  to 
  carnegieite. 
  

  

  crystalline 
  1335 
  2 
  hrs. 
  a 
  little 
  nephelite 
  

  

  " 
  1340 
  1/2 
  hr. 
  all 
  carnegieite 
  

  

  " 
  1.370 
  2 
  hrs. 
  a 
  little 
  nephelite 
  persists 
  

  

  " 
  1375 
  1/2 
  hr. 
  all 
  carnegieite 
  

  

  " 
  1392 
  2 
  hrs. 
  a 
  little 
  nephelite 
  persists 
  

  

  " 
  1397 
  1/2 
  hr. 
  all 
  carnegieite 
  

  

  Beginning 
  of 
  melting 
  of 
  carnegieite. 
  

  

  95 
  5 
  crystalline 
  1448 
  1 
  hr. 
  all 
  carnegieite 
  

  

  " 
  " 
  " 
  1452 
  " 
  a 
  little 
  glass 
  formed 
  

  

  90 
  10 
  " 
  1420 
  " 
  all 
  carnegieite 
  

  

  " 
  " 
  " 
  1424 
  " 
  a 
  little 
  glass 
  formed 
  

  

  Completion 
  of 
  melting 
  of 
  carnegieite. 
  

  

  95 
  

  

  5 
  

  

  a 
  

  

  a 
  

  

  90 
  

  

  10 
  

  

  u 
  

  

  a 
  

  

  85 
  

  

  15 
  

  

  a 
  

  

  a 
  

  

  95 
  

  

  a 
  crj 
  

  

  r 
  stal 
  

  

  line 
  1506 
  1 
  ; 
  

  

  hi 
  hr. 
  

  

  glass 
  and 
  carnegieite 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  1510 
  

  

  a 
  

  

  glass 
  only 
  

  

  90 
  

  

  10 
  

  

  a 
  

  

  1485 
  

  

  tt 
  

  

  glass 
  and 
  carnegieite 
  

  

  u 
  

  

  a 
  

  

  a 
  

  

  1489 
  

  

  a 
  

  

  glass 
  only 
  

  

  85 
  

  

  15 
  

  

  a 
  

  

  1463 
  

  

  a 
  

  

  glass 
  and 
  carnegieite 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  1467 
  

  

  a 
  

  

  glass 
  only 
  

  

  80 
  

  

  20 
  

  

  a 
  

  

  1436 
  

  

  a 
  

  

  glass 
  and 
  carnegieite 
  

  

  it 
  

  

  a 
  

  

  a 
  

  

  1440 
  

  

  a 
  

  

  glass 
  only 
  

  

  15 
  

  

  25 
  

  

  a 
  

  

  1413 
  

  

  a 
  

  

  glass 
  and 
  carnegieite 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  1417 
  

  

  a 
  

  

  glass 
  only 
  

  

  

  

  

  * 
  Ne 
  = 
  NaAlSiO, 
  

  

  h 
  Kp 
  = 
  KAlSi0 
  4 
  . 
  

  

  Am. 
  Jour. 
  Sci. 
  — 
  Fourth 
  Series, 
  Vol. 
  XLIII, 
  No. 
  254. 
  — 
  February, 
  1917. 
  

   9 
  

  

  