7° MINERALOGICAL 
in different fhades, After being filtred 
and faturated with vitriolic acid, the co¬ 
lour became crimfon, and a fmall brown 
precipitate was let fall, which, collect¬ 
ed, proved to be calx of manganefe, 
without any tungfienic acid. 
The dark brown powder which re¬ 
mained upon the filtre after the folu- 
tion of the calcined mafs, being edul¬ 
corated, dried, and heated, was totally 
attracted by the magnet. 
This analyfis fufficiently fhews this 
mineral to be iron mixed with manga- 
© 
nefe j on which account I have named 
it, “ Liver-coloured haematites,, mixed 
with manganefe in ochraceous iron-ore/* 
Wolfram from Poldice« 
§ r - 
Four ounces of wolfram well feparated 
from its flony matrix, were powdered, 
and 
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