86 Green Vitriol, or Englijh Copperas . 
where:the whole Procefs is at an End. Its 
regular Cryflals are rarely found in this Ex¬ 
amination, but a Couple of them, as obtain¬ 
ed by diflblving a Lump of our Subject in 
boiling Water, and leaving it at Reft for 
a- Day or two, are placed at the Side of 
the Drop. The hrft of them A, is one out 
of a great many that were formed on the 
Side of the Glafs wherein the Solution flood, 
and adhered thereto. Thefe being pro¬ 
duced in the clear Part of the Liquor, above 
the ferruginous thick Sediment which 
had been precipitated but was not taken 
away, were much greener and more trans¬ 
parent-than the Vitriol firft diffolved. Ex¬ 
cepting fome Irregularities, they were all of 
the fame Shape, with Sides nearly corre- 
fponding. 
The. Figure B reprefents an Odlaedron, 
that being the general Shape of many Cry- 
ftals formed in the yellow thick Sediment 
at the Bottom, a Fortnight or three Weeks 
after, the clearer Part of the Liquor having 
been poured away: and confequently the 
Difference of Figure between this and the 
former muff be imputed to the much 
greater Proportion of Iron in this than 
that. 
Our green Vitriol, or Englifh Copperas, 
is made from the Pyritre , that are found 
in great Abundance on the Shores of Suf¬ 
fix, E/fex, Kent, &c. Thefe Bodies are 
• of 
