29 



TAB. CCCXIX. 



STRONTIA sulphata. 

 Stellated Sulphate of Strontia. 



Div. 2. Imitative. 



This is rather a geological specimen, and may be useful 

 as an example of the black rock of Bristol, with the hol- 

 low showing Carbonate of Lime, Fluate of Lime, and 

 Sulphate of Strontian, and the rocky mass or gangue is 

 in this instance of the same formation as that of Derby- 

 shire, dark Limestone, and like that is a variety of Slink- 

 stein holding entrochi, shells, Sec, as the present spe- 

 cimen does : it is also analogous to that of Ireland. Having 

 thought it more essential to figure the substances, that they 

 may be known first, it may be presumed I need but in a 

 few instances repeat them in the form of rocks, as the 

 gangue in many instances, or the whole in some, form 

 the rocks already, as the Micas and Feldspars in Granite ; 

 the Analcime, &c. in other rocks. 



I was favoured with this specimen by Mr. Herbert, a 

 very ingenious collector, of Bristoh 



