127 



The minerals with which the neptunite of this type is 

 associated are in general the same as those accompanying 

 type Ï. Epididymite needles traverse the neptunite crystals and 

 are, consequently, earlier than these. The elpidite is probably 

 formed simultaneously with the neptunite , for these minerals 

 mutually interpenetrate each other. Decidedly later are: parisite, 

 fluorite, polylithionite, calcite and cordylite , this last mineral 

 being particularly characteristic of this locality. 



Type I[[. 



The neptunite crystals of the third type are in general 

 smaller in size than those of the two other types. The largest 

 individuals that have been observed measure only 3 — 4°"° in 

 length and 1 — 2""™ in thickness. They occupy in some measure 

 an intermediate position between the crystals of the first and 

 those of the second type, differing, however, in habit from both. 

 They are somewhat more elongated in the direction of the 

 vertical axis than those of type 1 , but have not the pointed 

 termination that characterizes type II. Ail the forms observed 

 on the foregoing types, with the exception of q, occur also on 

 these crystals, and, besides them, several new ones. The most 

 important combinations are shown by the Figs. 8 — It, Plate VI. 

 The forms are: 



a = {lOO}, è = {010}, c = {00l}, ш = {110}, d = [ш] , 

 е={ш}, /■={Г01}, s = {in}. y={22l}, x = {M\}, 

 ;._{22l}, o = {ril}, / = {Г!2}, ^J = Rll}, u = [b\2}. 



The crystals are excellently developed with sharp edges 

 and corners, smooth and very brilliant faces, so that very 

 accurate measurements can be obtained. The most common 

 combination is represented by Fig. 8, Plate VI. In the vertical 

 zone occur the first and the second pinacoid. The forms s 



