[ 43 * 3 
do not deny, that fome Stones fold for Turquois , 
and poffibly all that the Doctor faw were certainly 
fach $ but I imagine thofe which the Authors call 
,©f the old Rock, and in which the Colour is per- 
manent, are real mineral Stones : This Sample now 
-before us feems to fhew this, from both the Form 
and Size : Its Shape (hews it not to be Part of any 
animal Bone; but its botryoid Form is to me a De« 
monftration that it is the Product of Fire, which 
had once melted this Subftance ; and that when it 
cool'd, its Surface was formed into Bubbles and Blif- 
ters, in the fame manner as the Hamatitis botryoi - 
des or Bloodftone, whofe Surface conftfts of Knobs, 
refembling a Bunch of Grapes. 
That the Elephas epvxfaV, or Ebur fojjlle of Theo- 
phraftus *, faid to be of various Colours, I do not in the 
lead deny to be tinftured with Copper, and to be what 
Dr. Woodword calls the Turquois .-Indeed I fufped it to 
be what T)e Boodt calls of the new Rock $ and fays is 
liable to lofe its Colour, which it recovers again from 
the Effluvia of the Perfon who wears it. I therefore, for 
Diflindtion fake., think all thefe Stones of thelvory Ori- 
gin fhould be called Pfeudo-Turcheji#, or baftard 27/r- 
qaois 5 and the other Sort, of which this before us 
is one, the true or real Turquois > for, by Examina- 
tion in the chemical Way, I End it to be a very 
.rich copper Ore.; fome of it pounded and diffolved 
in Spirit of Hartfhorn gives a deep Blue ; in Aqua 
for.tis a fine Green ; and an iron Wire put into it 
was in j Hour's time incrufted with Copper : Some 
of it calcined, without any Flux in a Crucible, run 
K k k to 
* See Theophraftus' s Hid. of Stortrs ; 5 tranflated, tsV. John Hil ! 9 
Lend. 1746. 8\ p. _94« 
