ior 
OF CORNWALL. 
rhomboidal fcales, from the fourth of an inch diameter and under. 
The charge confifts of dulky cinereous granules, in fome places 
dark and fibrous as cockle, not only granulated, but veined ; the 
ground and charge equally hard. This Hone at Treaflo is exactly 
tne lame in ftrudure and colour as the red Egyptian granite, and 
lies in a vein about a bow-lhot from the houfe, eroding the publick 
road which leads to Caftelandinas, and may prove better at depth 
than at the top, where I found it. It weighs to water as 2 77 
to one. 140 
Of a richer kind is the red granite firft taken notice of by the 
difeerning Right Honourable Lord Edgcumbe, by whofe diredions 
tables were firfc made of it, and very handfome fiands for bulls and 
vafes. In the new hall, at Mount Edgcumbe, have been lately 
ereded two chimney-pieces principally of this kind of done ; and 
indeed to this noble Lord this belt of our Cornifii granites remark- 
able for its bold ruddy colouring and high and durable polilh, is 
chiefly indebted for being refeued from obfeurity, and eftimated at 
fo high a price as it is at prefent by the curious. 
In the parifli of Ludgvan there is a granite of a black cockle Black granite 
ground , charged fo thick with white fpots oi femitranfparent quartz, 
from an inch long by half inch wide and under ; that the charge 
almoft rivals the ground in quantity, it is much harder than the 
dove-coloured granite of the fame parifh, and weighs to water as 
2 - - ”5 to one. 
A better ftone of the black kind is found at Bofworlas, in the 
parifli of St. Juft ; the ground is of a blacker cockle than the fore- 
going, and is interfered in all diredions by toothy mafles of a warm 
flefh-coloured quartz, moftly in the parallelopiped fhape ; fome- 
times curved, now and then in a zig-zag manner, and fometimes in 
the form of a crofs ; in diameter, from half to one-fixth of an inch, 
by two inches long and under. The charge in depth confifts of two 
Jirata (fometimes three) of laming from the twentieth of an inch 
thick and under, with lucid furfaces parallel to one another, but 
lying at different angles with thole of the adjoining jiratum ; fo 
that when one is oppofed to the light and fliines, the other, which 
abutts at the end of it, does not. This is a moft curious and beau- 
tiful ftone, extremely hard, may be had in large pieces, and will 
doubtlefs with labour attain to a high polilh for tables and orna- 
ments. It weighs to water as 2 - - ^ to 1 . 
ihe marble we have in Cormvall is not remarkable either for its sect.viii. 
beauty or ufe. In the parilh of Carantoc, and at New Kaye, in 9 f the Cor_ 
Lower St. Columb, there is a coarle cinereous marble veined with mfh marble ’ 
v mite fpar : it ferments ftrongly with aqua fortis , gives no fire w T ith 
D d „ fteel, 
