lg8 N A T U K l & $ « 1 ,J>I0 R Y
fheMte, one’ without another, like the .« » S ite s , from the.bighefs
of a tbrpar' to a cylinderiof twofincbfes diameter . I
SECT.tn.
Green ore.
I o f thé èreeh'coppers,.tóm'e amias light as/afoather, being, meer
drwo, pr'verdegris1 ;-Yo*rriore folid;:and
either; Tomé- a thick incruftation .of.a green. One
fample is very ponderous, (Fig. xm. ib.> nothing o f .ftone pr.ruft
aptors, the texture confuting offmall fhinmg/r^, parallel, glqffy
as fetin, extremely‘rare.: It appeaxsbto .be a,folution o f. copper
which diftilled ^its! gloffy filaments^pon a tlpn ihell o f the hnelt
flake-ore, •p^ ;öf\whi^'c3q»^f :i ^ a « c n r
O f the greeft-colouf ed there is alfo a flaky kind's of *clofe contesfc-
ture, fometfrnes cohering in tubes as itIdrops„,(N0. xi.-ibid.,) but
forming a richer, clofer, and more polifhed furface ftill when; gets
(as Fig. x.ixivyxfr.) which is perhaps one;of the moft. curious
pröduöictós^ofThëjööfipif kind. It is of twofforts, -the. rich, deep
m m , arid the pale blue; the firft much the more precious* and belt
förmèd, prettily clouded,vïfèts well in rings,' but whetherfit-; maffee
reckoned a gem of the turcois kind, as has been ^ eady. obferved
among the gems, page tfï6, I will not affert N>. x. - came frorn
Mr. Baffet’s work called the Pool*,' the others, xiv,. xv. from Lord
Godblphiri’s mine in Ludgvan, called. Huel-fortijne. r
sect. iv. Befides the pale flaky blue mentioned above, 1« fiave^ilriVife a
Blue ore, blue earth o f an extremely fine and Snail grit, but
quantity I ever few does not exceed the bignefs o f a !ftarl ,ct?~
nous earth is likely thrown away, becaufe.it appears in- ftfô'h little
quantities as nature generally diftributes her mofb.precibus gifts in.
I have had it from two places, fromhhePool, arid the other, uncertain.
'O f the lapis Itkiili I have never yet feen ’ any, found in a
Comifh copper-mine, but this gritty blue is . as it were the powder
o f it, and feems a kind o f that precious ftone incomplete, irid not
fufficiently hardened.
se c t . v. T he grey-ore is often prettily {potted with yellow and.purple,
Grey ore. but the more of this mixture the lefs is its value. When it is o f
an uniform lead colour throughout, it is richeft, and contains a great
deal more metal than the yellow or green, being worth between
fifty and fixty pounds per ton.
s e c t . vi. Copper appears fometimes as a blue-black earth, of an indigo
Black ore. colour, very light, interlaced with an opake bafe cryfial. Mixed with
according to the faltswhich produced them. Boerh.
The. of them. Engl, page 88. >A;f
* Plate xvni. page i6g,
r Fig’.v , VI, VII, v in , ix. xi. PJ. lb. p, 200.'
* Thelê Ærugo’s, viewed in a microfcope, appear
to be clufters of cryftals of various colours,
water
O gjg C^, 0 R N W A L L. 199
Water- it0ftya.rfoh blue, bu1|;with nut*or poppy oil it, makes a
deep ivqyy-hlaqM^'^e^des iftijs ■ , flack grit, there is a „more folid
kind of* black cq&r-ore, y e r^ 'j^ ’derousj it is bliftefed;.into large •
.tubercles, by viftiph it,ap^aMLthat it is a folqtipn,. of*,copper c<5fl-
creted .in a bed jfofr jfulphufy I dpd,^co.yered^Qyet;ywith; a , glafty,' Tpark-
Ung c r u f t : it .paayfpqpibly,be^worth jgvfeile for „thofejwfio prepare
paintsaby,firej^^.tRy.yfiether^ffine ,valuable^lu^Vcolgur, fuch as
Pruffian blue or tiltra-marine,. may not be extraded from the blue
grit, Section n^Land thofe twMHack qpraqr earths. (
The red-ore >mixed with glafly foecjdes t(theory ftallized falts o f sect.vii.
^this metal1}, is .called the fire-ore,; it rifesgenerally in fmalljtjle tacHed Red ore-
iglebes from a ’bed o f eoarfe ochre,. 0ndf&yforrugfoeous V,wKZ(;<2:,.co-
fvered at times'with a cruft of lapideo.ys green copperf fome o f ft
is a1 folution, 3 . by the bliftered,- granules appears; fome me "natural
ore ; it ;fs£Wery ponderous, and imore valuable, tlj^n anv.-of, th& reft.
.Some ores o f this (.colour (break inJ;oiyffimmg/,forfaces, ‘andTefenible
do much the,ores o f filver,. that Yearce.any o n e a n thftihguifh the
flargeft grains o f this fort' ftom the argentum rubrum or Aqdreafberg
jn .which contains betwixt, ftighty. arid .n in e ^ .^ t s o f
for hundred ,o£ fikqr, .the wafte flying o ff,,feeing ^ i^ r , afiynick.
This beautiful and rich ore., is never feved jfeparately frdm me‘re|fe,
^.though it promifes fo ' fair for filver. It was fuppdied by fome
gentlemen atLeyden, to whom I fent a E r |e fpecimen, clofoTgrained
and folid,. ?jfiat it contpned mueft zirik.
! T h e moft perfebt copper, from'which the before-mentioned Jarp sect.vui.
'only fo many inferiqur and different removes, is the Malleable {from Malleable
ftsrputfty^ledvin Cornwall the Virgin-ore), which, in fmall quan-
}titiy ftt leaft, is found in d l die moft confiderable cbpper-mines. It is
varibufij^ combined and allayed 5 fome with bafe cryftal (granulated)
intermixed;, fome with goflan,, fome with white gravblly clay', fome
jin riddle and the ruft o f iron; in fhape ver^,yanpusi fometimes thiif
fpread, and fhaped like leaves, now like drops and bofles, now branched,
?fringed, or twilled into1 wires, in ‘ hollow filagree, in blacfos and
daggers, now. in. powder little inferiour in luftre to that o f gold;
fometimes bliftered, at other times a congeries' o f combined graf
:foule|V;but which is the firieft ^of all, fometimes^inT^lid lumps ^(as
the Mumon copper) of feverd*- pounds weight, lmfotufatbd,^unmix-
edi and highly polifhed.
Fig; i. Virgin-ore, Tomewhat bliftered; it has .feveral ‘little c o - sect.ix.
lumns at a, crofling each otherlike bones, with’'0 knob^orjiunches ■ i u j . pers,p k te x n .
;*» A very rare fpecimen from the Pool.- |
at