﻿Palache 
  — 
  Epidote 
  and 
  Garnet 
  from 
  Idaho. 
  299 
  

  

  Art. 
  XXXIII. 
  — 
  Note 
  on 
  Epidote 
  and 
  Garnet 
  from 
  Idaho 
  ; 
  by 
  

   Chas. 
  Palache. 
  

  

  In 
  the 
  fall 
  of 
  1898 
  Messrs. 
  C. 
  L. 
  Whittle 
  and 
  Wm. 
  Beals, 
  

   Jr., 
  presented 
  to 
  the 
  Harvard 
  Mineralogical 
  Museum 
  a 
  suite 
  of 
  

   mineral 
  specimens 
  collected 
  by 
  them 
  in 
  the 
  Seven 
  Devils 
  Min- 
  

   ing 
  District, 
  Idaho, 
  chiefly 
  from 
  the 
  Peacock 
  and 
  White 
  

   Monument 
  mines. 
  The 
  ore 
  of 
  these 
  mines 
  is 
  argentiferous 
  

   chalcocite 
  and 
  bornite 
  ; 
  these 
  specimens, 
  however, 
  show 
  but 
  

   little 
  ore 
  material, 
  being 
  composed 
  almost 
  wholly 
  of 
  the 
  asso- 
  

   ciated 
  vein 
  minerals, 
  among 
  which 
  were 
  determined 
  : 
  (1) 
  from 
  

   the 
  Peacock 
  Mine 
  — 
  epidote, 
  almandite 
  garnet, 
  quartz, 
  chryso- 
  

   colla, 
  malachite, 
  brochantite, 
  hematite, 
  and 
  chlorite 
  ; 
  (2) 
  from 
  

   the 
  White 
  Monument 
  Mine 
  — 
  calcite, 
  malachite, 
  melaconite, 
  

   grossularite 
  garnet, 
  and 
  epidote 
  ; 
  (3) 
  from 
  the 
  Copper 
  Key 
  

   Mine 
  — 
  andradite 
  garnet. 
  

  

  The 
  Peacock 
  Mine 
  was 
  the 
  source 
  of 
  the 
  pow'ellite 
  first 
  

   described 
  by 
  Melville;* 
  the 
  specimens 
  were 
  therefore 
  carefully 
  

   searched 
  for 
  that 
  mineral 
  but 
  none 
  was 
  found. 
  

  

  Fig. 
  1. 
  f(OOl), 
  a 
  (100), 
  m 
  (102), 
  W 
  (305), 
  V 
  (405), 
  e 
  (101), 
  (7(103), 
  «(l02), 
  

   r(IOl), 
  /(201), 
  z(llO), 
  o(011),_p(016), 
  «(Ill), 
  2/(211), 
  /;(212). 
  

  

  Fig. 
  2. 
  c(OOl), 
  a 
  (100), 
  6(010), 
  e(lOl), 
  m 
  (102), 
  / 
  (301), 
  Z(201), 
  r 
  (101), 
  5(203), 
  

   2(102), 
  C7(l03), 
  2(110), 
  ?^210), 
  o(Oll), 
  w(Ill), 
  a;(Il2), 
  d(lll), 
  ^(221). 
  

  

  Epidote. 
  — 
  Epidote 
  is 
  the 
  most 
  abundant 
  and 
  most 
  interest- 
  

   ing 
  mineral 
  present. 
  It 
  is- 
  in 
  well 
  developed 
  crystals 
  lining 
  

   the 
  walls 
  of 
  cavities 
  in 
  massive 
  epidote. 
  The 
  crystals 
  are 
  dark 
  

   green 
  in 
  color 
  and 
  often 
  of 
  large 
  size, 
  the 
  largest 
  collected 
  

   being 
  two 
  inches 
  in 
  length 
  and 
  breadth. 
  Mr. 
  Whittle 
  saw 
  a 
  

   cavity 
  in 
  which 
  a 
  large 
  number 
  of 
  perfect 
  crystals 
  upwards 
  of 
  

   a 
  foot 
  in 
  length 
  had 
  been 
  destroyed 
  by 
  the 
  miner's 
  pick. 
  

  

  The 
  crystals 
  have 
  the 
  normal 
  epidote 
  habit, 
  prismatic 
  parallel 
  

  

  * 
  W. 
  H. 
  Melville, 
  this 
  Journal, 
  xli, 
  1891, 
  page 
  138. 
  

  

  