SCHALLKR.] 



Minerals from Leona Heights. 



20!) 



The combinations of the forms on the two crystals (Fig's. 8 

 and 9, PI. 1!)) are shown in the following table : 



C am t, S it 6 cr 



Cryst. 

 No. 



1 



a III -JT c — 



a m t z 7T — cr 



c — = \ 00l\. The base occurred only on one crystal. The 

 reflections were excellent from both faces. 



a = ooO = jlOOj. The orthopinacoid was present on both 

 crystals but gave only a good reflection on the one crystal. 



m = co = jllOj. The prism faces were small and very poorly 



developed. The reflections were poor. 

 t.= — 10= JlOlj. This dome occurred as a large face. The 



reflection was fair. 

 z = — 30 = <3"01f. This form occurred as a face not so large 



as t, the reflection being but fair. 

 t = — i = \ 112 1 . This pyramid was noted on both crystals, 

 e = — 1 =|lllf. This pyramid and the preceding one occurred 



on one crystal, the unit pyramid being rather large. The 



faces lay in the zone cm. 

 <r = — 12 = 1 121 ! . This form occurred as two large faces, the 



reflections being, however, poor. 

 The following table gives the calculation of the forms 

 observed : 



a = 1 .1622 



180 -$ J ' 4 - 4 



lg a = 0.06528 



lg c = 0.17609 



lg ao = 9.88919 lg po = 0.111)79 



lg bo = 9.82391 



lg e 



lg go = 0.15978 



Po 



,9.98370]:-"' 9.42962 lg — =9.95101 



lg sin /x I | lg cos fx J 8o 



^0 



^0 



ao = 0.7747 



bo 0.(!(iU7 



po = 1.2900 



50 = 1.4447 



e = 0.2689 



(Prism ) 



(x : y) 



d' 



-tep 







ooO 



00 



—1(1 



-30 



— * 

 — 1 



—12 



001 

 100 



no 

 loi 



301 

 112 

 111 

 121 



90° 00' 15° 30' 15° 36' 

 " |90 00 90 00 

 41 47 

 90 00 45 37 155 37 

 74 29 74 29 

 5T 21 

 46 41 



27 31 

 35 16 

 19 28 



40 13 

 61 26- 



72 33 



0° 00'! 15° 36' 

 " 90 00 

 90 00 41 47 

 00 |l5 37 

 74 29 



36 52 

 56 IS- 

 71 34 



T7 22 

 30 28 

 18 32-164 05 



0°00'0.2792 

 ac 



4S 13 0.8933 

 00 T.0217 

 " 3.6030 

 34 56 jo. 3908 

 45 49 |T.0608 



.7500 

 1.5000 



0.2792 



1.0217 

 3.6030 

 0.8457 

 1.8372 

 3.0000i3.1820 



