27 



TAB. CCCXVI1I. 



S I L E X Quartzum, cryst 

 Crystallized Quartz, 



Div. 1. Crystallized. 



I place this as a most curious example of Ouartz new to 

 the mineralogical writers, the six vertical edges of the co- 

 lumns of the crystals being truncated, doubling the num- 

 ber of the faces, as well as those of the pyramid, which 

 also show the manner of the nuclei accumulating to form 

 various sportive modifications ; and some of these plates 

 meeting in seams, as I have called them, tab. 317j di- 

 stinctly show their nature. Another curiosity attached to 

 this group is a rotate accumulation of the columnar garnet- 

 formed Carbonate of Lime, or perhaps Magnesian Pearly 

 Spar. 



Dr. Turton has long deserved my best acknowledgements, 

 as well as those of the public, not only for his literary ta- 

 lents in the translation of Linnceus's Sysiema Nature?, but 

 in his other endeavours to assist in the general knowledge 

 of Natural History ; nor does he omit to collect specimens 

 that are useful to those engaged in pourtraying any parti- 

 cular branch. Among many other kindnesses I am glad 

 to acknowledge the present most valuable specimen, for its 

 novelty and very instructive formation. I should think it 

 were a loss to the public, in a work that is to serve in many 

 instances instead of an expensive cabinet, to omit the whole 



