So ASYSTEMOF 



SECT. LXXII. 



2- Cockle or Shirl, Bafaltes; Corneus cryftal- 

 lijatus Wallerii ; St annum cryftallis columnari- 

 bus nigris Linnai. 



Is a heavy and hard kind of ftone, which 

 moots into cryftals of a prifmatical figure, 

 and whofe chief colours are black or oreen. 

 Its fpecific gravity is the fame as the garnets, 

 viz. between 3000 and 3400, though al- 

 ways proportionable to their different foli- 

 dity. 



A- Cockle, or fhirl, mixed with iron, Bafaltes 

 martialis. 



1. Coarfe, without any determined figure, 

 Bafaltes parti cults palpabilibus figura in- 

 determinata. 



a. Green, found 'in moft of the Swedifh 

 iron mines. 



by expofing it to a heat augmented by degrees, becaufe then 

 the tin and lead fvveat out in form of drops, almoft pure f 

 though always fomewhat mixed with iron. 



The criftallifations of the garnets are fo far different from 

 one another, that fome have a greater and fome a lefs num- 

 ber of facets, or fides ; but this has no relation or dependence 

 either on their contained metals, their colour, or their 

 tranfparency ; wherefore, in order to avoid a prolixity, 

 which is uonecefiary, I have omitted fuch varieties, and only 

 obferved that they are round or fpherical, with facets. Be- 

 &desy there is not yet discovered any figure amongft them 

 which is abfolutely particular and remarkable, for the 

 granatin dodecacdros ex r bom bis Linn^ci are difperfed every 

 where in the rocks at Kongsberg, in Norway. 



SECT. 



