I9 8 NATURAL HISTORY 
fheaths, one without another, like the dala&ites, from the bignefs 
of a thread to a cylinder of two inches diameter y . 
sect. in. Of the green coppers, fome are as light as a feather, being meer 
Green ore. cerugo , or verdegris 2 ; lome more folid and dony , little metal in 
either ; fome a thick incrudation of a deep velvet green. One 
fample is very ponderous, (Fig. xm. ib.) nothing of ftone or rud 
appears, the texture confiding of fmall fhining Jlriez, parallel, glofiy 
as fatin, extremely rare. It appears to be a folution of copper 
which diddled its gloffy filaments upon a thin fhell of the fined 
flake-ore, part of which caps this fpecimen dill at a , b. 
Of the green-coloured there is alfo a flaky kind of dole contex- 
ture, fometimes cohering in tubes as it drops, (N°. xi. ibid.) but 
forming a richer, clofer, and more poliflied furface dill when it gets 
free (as Fig. x. xiv, xv.) which is perhaps one of the mod curious 
productions of the copper kind. It is of two lorts, the rich, deep 
green, and the pale blue ; the fird much the more precious and bed 
formed, prettily clouded, fets well in rings, but whether it may be 
reckoned a gem of the turcois kind, as has been already obferved 
among the gems, page 1 1 6 , I will not aflert N . x. came from 
Mr. Baflet’s work called the Pool*, the others, xiv, xv. from Lord 
Godolphin’s mine in Ludgvan, called Huel-fortune. 
sect. iv. Befides the pale flaky blue mentioned above, I have likewife a 
Blue ore, blue earth of an extremely fine and fmall grit, but the greated 
quantity I ever faw does not exceed the bignefs of a bean : this cu- 
rious earth is likely thrown away, becaufe it appears in fuch little 
quantities as nature generally didributes her mod precious gifts in. 
I have had it from two places, from the Pool, and the other, uncer- 
tain. Of the lapis lazuli I have never yet feen any found in a 
Cornifli copper-mine, but this gritty blue is as it were the powder 
of it, and feems a kind of that precious done incomplete, and not 
fufficiently hardened. 
sect. v. The grey-ore is often prettily fpotted with yellow and purple, 
Grey ore. but the more of this mixture the lefs is its value. When it is of 
an uniform lead colour throughout, it is riched, and contains a great 
deal more metal than the yellow or green, being worth between 
fifty and fixty pounds per ton. 
sect. vi. Copper appears fometimes as a blue-black earth, of an indigo 
Black ore. co lour, very light, interlaced with an opake bafe crydal. Mixed with 
1 Fig®, v, vi, vii, vm, ix. xi. PI. ib. p. 200. according to the falts which produced them. Boerh. 
* Thefe /Erugo’s, viewed in a microfcope, ap- The. of Chem. Engl, page 88. 
pear to be clutters of cryftals of various colours, * Plate xvm. page 169. 
water 
