75 
TAB. CCXXXVIIL 
BARYTES sulphata. 
Sulphate of Barytes. 
Class 2. Earths. Order 1. Homogeneous. 
Gen. 6. Barytes. | Spec. 1. Sulphate. 
Div. 1. Crystallized. 
SSE 
Wuen any thing unusual comes under our investigation, 
it is a pleasant task to account for it if we can. Subjects 
of the present nature may not be uncommon, therefore it 
is the more convenient to comprehend them. The speci- 
men here represented is particularly interesting and in- 
structive, as the forms are strikingly curious, and show 
the tendency of the molecules to form according to the 
laws of Crystallography, notwithstanding certain interrup- 
tions. In this instance the gravity of a quantity of Sulphate 
of Barytes in solution has seemingly caused it to settle in 
contact with a loose powder, consequently having more air 
in its interstices, which, as the Barytes subsided, has risen 
into the substance, and, in part, interrupted the mass, 
while at the same time it gives them particular forms and a 
curious appearance ; some of the powder filling them up more 
or less towards their bases, which are sometimes quadran- 
gular, but mostly hexangular—see the right hand figure— 
where it appears that the greatest part of the hollows and 
the larger sides of their bases are diagonal to the primitive 
_ fracture. The variety in the forms of the hollows are in- 
