TAB. LXX. 



BARYTES sulphata, var. primitiva. 

 Sulphate of Barytes. 



Class 1. Earths. Order 1. Homogeneous. 

 Gen. Q. Barytes. Spec. 2. Sulphate. 



Spec. Char. Combined with sulphuric acid. 

 Syn. Baroselenite. Kirw.v.1.136. 



Schwer-spath. Emmerl. v. 1. 550. 



Baryte sulphatee. Haiiy, v. 2. 295. 



Natrum cristatum. Linn. Syst. Nat. v. 3, 90. 



Ponderous Spar, as this was commonly called in Eng- 

 land, agrees with the Greek term fixpvtys, heavy. The 

 uncommon weight of this substance in comparison to that 

 of other stones has very naturally obtained it this ap- 

 pellation. It is frequent in or near lead or iron mines 

 in many parts of the world; as well as in many places 



in Great Britain, as Derbyshire, Cumberland, &c. 



When transparent, it is generally crystallized and separa- 



