A SYSTEM OF 
'tPt- 
h Yellow, from Baftnafgrufva at Rid-" 
darfhyttan in the province of Weft^ 
manland, 
Spathofe, and with an unftuous fur« 
face. 
a. White, from Marienberg and AR 
tenberg, in SaxonVf 
i. Pearl - coloured, from Bifpberg 
Klack, in the province of Dalarne 
SECT, ecxi. 
B> DIfiblved or mineralifed iron, Ferrum mineral 
lifatum. 
1, With fulphur alone, 
a* Perfedlly fatu rated with fulphur, 
fulphure faturatum. Marcafite. See Sul- 
phur, Seft. clii. 
h With very little fulphur. Black iron 
ore. Iron ftone. Miner a ferri atra. 
This is either attracEled by the load- 
ftone, or is a loadftone itfelf, attra 6 ting 
iron; it refembles iron, and yields a 
black powder when rubbed, 
3 . Magnetic iron ore, Minera ferri attrac-> 
toria. The Loadftone, Magnes. 
Steel-grained, of a dim texture, 
from Hogberget, in the parifti of 
^ This kind of ftdnc is very feldom met with, but in fuch 
places where black lead is common in the neighbourhood ; and 
che hiftory of the black lead, inferted in the Memoirs of the 
Swedifti Academy of Sciences, has induced me to believe, that 
this may contain fome tin, which merits further examinationo 
Mr. Cronftedt has in the faid Memoirs communicated his ex- 
periments upon this kind of ftone from Riddarlhyttan, and 
Bifpberget in Weftmanland ; as has alfo Mr. Rinman, on a 
great number of other martial earths. See the faid Memoirs 
for the years 1751 and 11 sX, 
Gagncef 
