Vol. 5] 



Eakle. — Beryl; Tabular Calcitc. 



89 



BERYL. 



Occurrence. — Two distinct varieties of beryl are found in the 

 county, one green and the other pink or rose in varying shades. 

 The green crystals came from Eineon, and are characterized by 

 a long slender prismatic habit, one end only having terminations 

 as a rule. 



Forms. — The forms occurring are : 



m 1 1010 1 c { 0001 \ o |ll22j 



i \ 2130 1 p J 10T1 1 y { 13.1.11.1 j ? 



a j 1130 \ s 1 1121 } 



In the prismatic zone the unit prism usually predominates, 

 yet the dihexagonal prism is sometimes equally large ; the second 

 order prism is very narrow when present, but is generally absent. 

 The dominant terminal form is s (1121), leaving the unit pyra- 

 mid as small triangles. The base and o (1122) are small planes. 

 The indices of the form y (13.1.14.1) are doubtful because the 

 faces were very dull and only approximate reading could be 

 made. 



<P P 

 Measured 3° 26' 83° 45' 



Calculated 3° 40' 82° 41' 



Two of the crystals are milky green and opacpie and show the 

 unit prism with i and a as mere line faces. The terminal forms 

 are s, p, c and an indeterminate form between m and s, which was 

 too dull for measurement. 



The rose beryls came from the Little Three mine, near Kincon. 

 They are short prismatic and doubly terminated. 



The forms present are : 

 m ) 10T0 | , s j 1121 \ , p \ 1011 \ , and c \ 0001 \ ; in which c and s predominate. 



TUBULAR CALCITE. 



Occurrence. — During the exploration of the Potter Creek cave 

 in Shasta County, California, 12 W. J. Sinclair collected some of 

 the smaller stalactites which abound in the cave. 



Description. — The ordinary stalactitic shapes as well as hol- 

 low cylinders are common, and their formation has been due to 



12 Univ. Cal. Publications, Amer. Arch, and Ethnology, 2, No. 1. 



