CONTRIBUTIONS TO MINERALOGY— SHANNON. 



439 



Fig. 3.— Crystal of anglesite. 



A second specimen, a more recent accession (No. 93235), was 

 donated by I. Pett, of Salt Lake City, through V. C. Heikes. The 

 locality is given as the Eagle and 

 Bluebell mine, Tintic district, 

 Juab County, Utah. This speci- 

 men consists of a 5-kilogram mass 

 of granular galena containing in- 

 clusions of limestone and contain- 

 ing small round cavities, in which 

 the anglesite crystals are depos- 

 ited. The crystals range from 

 those 2 centimeters in diameter 

 down to some a millimeter in di- 

 ameter. The largest crystals are 

 slightly smoky, but the smaller 

 ones are very clear and brilliant. 

 No native sulphur or other sec- 

 ondary product is associated with this anglesite. The commonest 

 habit of these crystals is as shown in figure 3, short prismatic, parallel 

 to the vertical axis. The number of 

 forms present varies directly with the 

 size of the crystals, the larger individ- 

 uals exhibiting the rare or unusual 

 forms. On crystals of this type the 

 forms found are a(lOO), 6 (010) ,"^c(001), 

 ^(102),?(104),o(011),m(110),7i(120)i 

 A^(310), x(130), r(112), s(lll), 

 t(221), ^(324), and 2/(122). The 

 prism zone is vertically striated. 



In a smaller cavity on one side of 

 this specimen there were small groups 



Fig. 4.— Cr-s'stal of anglesite. „ ■^,. ,,, .. ^ ^ . \ 



of crystals m parallel position, which, 

 while having the same general appearance, were elongated parallel 

 to the a axis. The appearance of these crj^stals is shown in figure 4, 

 the forms present being 

 a(lOO), c(OOl), m(llO), 

 x(130), o{011), 6'i(023)*, 

 3(lll),^(324),andr(112). 

 The third and largest 

 specimen of Utah anglesite 

 in the National collections 

 (Cat. 93263) is also from 

 the Eagle and Bluebell F'«- s.-crystal of anglk^hk. 



mine, and was received from W. H. Parker through V. C. Heikes. 

 This is a mass of galena about 10 kilograms in weight, the upper sur- 

 face of which is covered with a drusy layer of quartz with small 



