17 



TAB. CX. 



SILEX baryticus. 

 Harmotome or Staurolite. 



Class 2. Earths. Order 1. Homogeneous. 

 Gen. 4. Silex. Spec. Barytic. 



Spec. Char. Combined with Barytes and Argil, fu- 

 sible into a frothy enamel, with a greenish phos- 

 phorescence. 



Syn. Staurolite. Klrw. 1. 282. 



Harmotome. Haily, 3, 191. 

 Kreuzstein. Emmerling, 1. 209. 

 Hyacinthe blanche cruciforme. De Lisle, 2. 299. 

 De Born, 1. 79. 



British Staurolite has only been observed hitherto at 

 Strontian in Scotland, a place famous for Carbonate of 

 Strontian— see tab. 65. It is generally found on a gangue 

 of Carbonate of Lime, which is mostly crystallized. 



Its common form is a Quadrangular prism, with the lateral 

 solid angles truncated, and forming a four-sided pyramid, 

 alternating at each end; or, in other words, making an 

 elongated dodecaedron, similar to that of garnet, but not of 

 the same angle. Two of the opposite edges of the pyramids 

 are mostly truncated, in British specimens. The crystals 

 are generally larger than in those of Andreasberg, and more 

 nearly resemble those of Oberstein. 



VOL. II. C 



