I9§ 
A SYSTEM GE 
c, Criffiallifed. 
1. In o6loedrical criftals, 
2. In polyedrical criftals. 
3. In a celiular form, from Mofsgruf- 
van, at Norberg in Weftmanland. 
Thefe varieties are the moft com- 
mon in Sweden, and are very feldonr^ 
blended with marcafite, or any other 
heterogeneous flibftance, except their 
different beds. It is remarkable, that, 
when thefe ores are found along with 
marcafite, thofe particles, which have 
laid neareft to the marcafite, are at- 
traded by the loadftone, although they 
yield a red or reddilh brown powder, 
like thofe which are not attraded by 
the loadftone: It is likewife worth 
dbferyation, that they generally con- 
tain a little fulphur, if they are in- 
bedded in a lime-ftone rock, which 
however very feldom happens in Swe- 
den; but I know only one fuch in- 
ftance, viz. at Billfio, in Soderberke, in 
the province ofDalarne. Sed. ccxiii, 
SECT. CCIV, 
Blackifh brown bloodftone. Mama- 
tites mgrejcens. Kidney ore. 
This yields a red or brown powder 
when it is rubbed ; it is very hard, 
and is attraded by the loadftone. 
a. Splid, with a glaffy texture, from 
Wefterfilfverberget, in the province 
of Weftrnankxid, 
b. Radiated, 
f, Criftalljfed. 
' la- 
