478 



G. F. Kunz — Mineralogical Notes. 



It also occurs opaque, massive and cleavable, enclosing bright 

 cubic crystals of pyrite at times 25 mm across. Some of the 

 crystals are opaque while others are of a transparent flesh color. 

 At the Ule" mine, Lake City, Col., crystals, both opaque and 

 flesh -colored, rounded and curved like dolomite, are found on an 

 argentiferous galena. Some crystals were observed 23 mm across. 

 The faces are not polished but rough like the himbeerspaih. 

 With the spectroscope there is considerable absorption of the 

 citron, forming a decided dark band between the yellow and 

 the green. With the dichroscope the ordinary image is a 

 salmon-pink and the extraordinary light yellow sherry color. 



Crystals of Hollow Quartz. 



