R1 1 N E R A L O G Y. 83 
h. Deep green, from Salberg in Wefenan- 
land. 
€» Light green, from Enighets-grufvan at 
Norberg, in Weftmanland, 
d, Reddifh brown, from Sorwik, at Grengie 
in Weftmanland, and Glanfhammar, in 
the province of Nerike. 
The Tauffstein, from Bafll, is of this 
colour, and confifts 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 crofs-ftone ^ . 
* It is not impoiSbIe, that there may be foihe kinds of 
cockles, or fhirls, which, befidSs iron, aifo 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, from Rodbeck’s Eng, at Umea, in Lapland ; and it 
Teems likewife very probable, that the cockles which are 
found in the Englilli tin mines, may contain fome tin. There, 
are fome crillals of cockle found, which are fufible to a 
greater degree than any fort of ftone whatfoever ; thefe are 
always of a glaffy texture, and femi-tranfparent. 
7'he figure of the cockle crifials is uncertain, but always 
prifmatical : the cockle from Yxfio, at Nya Kopparberg, is 
quadrangular ; the French kind has nine fides, or planes, and 
the TaulFfiein is hexagonal ||. 
t The crofs-ftone is compofed of two claftes, for the bafis 
1 make a fluor, (See my Ledlures) and the croftes on it I agree 
with our author are accretions of Ihirl, or cockle. He 
denominates it, the Bajler I’auffitdn, Whether he means by 
Bafler the city of Bafil, as I have put it, or whether he means 
Befler, 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, 
ft local folfil, namely, of St. John de Compoftelia, in Anda- 
lulia in Spain. D. C. 
}] The name Cockle for thefe fubftances is an old Cornifij mineral name * 
htst is a!fo given fonnetimes to other very different matters. The name Shirl 
I have now adopted in Eng]i(h, from the com.mon German mineral term. 
We have not in England any great quantity of fpecics of cockles j the 
chief are found in the tin minC? of Coinwail, and 1 have feen fome fine 
criftallifed kinds from Scotland. 
G a -■ The 
