MINERALOGY. 83 



b. Deep green, from Salberg in Weftman- 

 land. 



c. Light green, from Enigliets-grufvan at 

 Norberg, in Weilmanland, 



d. Reddilh brown, from Sorwik, at Grengie 

 in Wefrmaniand, and Glanlhammar, in 

 the province of Nerike. 



The Tauffstein, from Bafil, is of this 

 colour, and confiib of two hexagonal 

 criftals of cockle grown together in form 

 of a crofs : this the Roman Catholics wear 

 as an amulet, and is called in Latin, lapis 

 crucifer^ or the crois-ftone * j. 



* It is not impoffible, that there may be fome kinds of 

 cockles, or fhirls, which, befides iron, alfo contain tin or 

 lead, as the garnets : but I am not quite convinced of it ; 

 though I have been told, that lead has been melted out of a 

 cockle, frcm Rcdbeck's Eng, at Umea, in Laplard ; and it 

 feems likewife very probable, that the cockles which are 

 found in theEnglifh tin mines, may contain fome tin. There 

 are fome criftals of cockle found, which are fufible to a 

 greater degree than any fcrt of Hone whatfoever : the fe are 

 "ays of a glafTy texture, and femi-tranfparent. 



The £o-'_:rs cf the cockl- criftals is uncertain, but always 

 prifmatical : the cockle from Yxfio, at Nya Kopparberg, is 

 quadrangu'ar ; the French kind has nine fides, or plane?, and 

 the TaufFliein is hexagonal \\. 



t The crcfi-ftone if cornpcfed of two clafles, for the bafis 

 I make a Boor, (See my Lectures) and the crofTes on it I agree 

 with cur author are accretions of fhirl, or cockle. He 

 deoominatej it, the Bo.jler Tapffitein. Whether he means by 

 Bafler the city cf Eafil, as I have put it, or whether he means 

 EeHer, the author who firft defcribed it, I cannot tell ; but cer- 

 tainly it is not found at or near Bafil, being, as far as I know, 

 a local fcflii, namely, of St. John de Compoflella, in Anda- 

 luf:a in Spain. D. C. 



Th? name Cockle for the r e fubftancea is an old Cornifh m'neral name ; 



but is a'fo giver, lorretimes to other very different matters The name Shut 



J have turn adopted in Er.gl/h, from the common German mineral term. 



Wc have r. ; ?lar>d any gr?a* quantify of fpecics of cockles; the 



• nd in the tin mine* of Cornwall; aid J have fsen fome fine 



Cr i— from Scotland. 



G z Th« 



