﻿./ G. Meem — Limonite Pseudomorphs after Pyrite. 275 



principal faces (m-m), as to present a general outline almost 

 spherical, this outline being made up for the most part of apices 

 of trapezohedral pyramids. In another spherical aggregation 

 the projecting crystals are combinations of cubes and trapezo- 

 hedrons, the faces of the latter in one or two of the crystals 

 being perfectly developed, while in many of the other crystals 



mm* 



^x 





«~- 





the trapezohedrons are only filled out along the edges, making 

 star-shaped figures around the cubic face (fig. 18). This 

 depression of the faces {m-m) in some instances has encroached 

 on the cubic face, making of it a star-shaped figure (fig. 19) but 

 not like the other. Another aggregate has the exterior crystals 

 very small, and its form is remarkably like that of an acorn and 



