from the Tilly Foster Iron Mine. 377 
merely a jointed structure; for the smaller blocks afforded by 
it have no cleavage within, but instead, a wax-like, massive 
tallizing in cubic forms, and, therefore, a new mineral species. 
It is simply common serpentine, which has somehow become 
Secondly, the cubic cleavages of the dolomite are only joints 
or divisional planes in rectangular directions. The demon- 
easy snes Ae cleavages, but an open cleavage structure, that 
is, cleavage-joints, such as exist in galenite ; for these cleavage- 
joints are the divisional planes or joints that are retained in the 
pseudomorph. 
ly su é. 
Acleediies. Gasbordivns sulphate of lime), although ortho- 
