119 
TAB. CCLXI. 
Talcose Breccia. 
Class 2. Earths. Order 2. A 
ug 
Ug 
regate. 
Havre, through the interest of my kind friend Dr. Penneck 
of Penzance, received from Mr. Joshua Carne fine speci- 
mens of the Grey Slate Pebbles, spoken of by him to our 
mutual friend Davies Giddy, Esq. M. P., I thought it 
doubly incumbent on me to give a figure of it; first from 
respect to the donors, and next on account of its curio- 
sity when examined in a geological point of view. I 
cannot describe it more satisfactorily than partly in Mr. 
Carne’s own words*. It is observed that ‘* The Relistian 
mine is nearly on a level with the surrounding country— 
the lode has been seen at the depth of 12, 25, 50, 65, 75, 81, 
and 90 fathoms from the surface. It is of different widths 
at different parts; the extreme width is 36 feet, and in this 
part it is principally worked. As it extends east and west, 
which is its due course, its width gradually diminishes, 
till at the distance of 100 fathoms east it is but 5 feet 
wide. It is composed, excepting the metallic part, of 
Schist +, Chlorite (in a distinct form), and Quartz. In 
some parts the Schist predominates, and in others the 
Chlorite; the Quartz is throughout the smallest component 
part. The engine shaft is situated 8 fathoms north of the 
widest part of the lode. In sinking the shaft, a flookan 
* Phil. Trans. 1807. Part ii. p. 293. 
+ Consisting chiefly of greyish green Talc or Chlorite. 
