35 
TAB. CCXVIILI. 
SILEX Quartzum; var. Jaspis. 
Red Jasper. 
Class 2. Earths. Order 1. Homogeneous. 
Gen. 4. Silex. Spec. 1. Quartzum. 
Div. 3. Amorphous. 
Syn. Quartz Jaspe rouge. Hawy, 2. 436. 
Gemeiner Jaspis. Emmerl. 1. 243. 
Jasper. Kirwan, 1. 309. 
Silex Jaspis. Linn. Syst. Nat. ed. 13. 
Green Jasper, or Ribband Jasper, has been figured at 
tab. 157, of this work. Red Jasper is also found striped, 
veined, &c. The present specimens are, however, the 
most usual of the red kind in Great Britain. The upper one 
came from a gravel-pit*, commonly so called, which has” 
a large and curious variety of stones in it, from whence 
most of the old pavement of the city of York is composed. 
I am obliged to my kind and indefatigable friend the Rev. 
J. Dalton for this, and some other very curious specimens 
from thence, cut and polished; and it is nota little cu- 
rious to knew that the lapidaries of York have been a long 
time employed cutting these stones, which they call 
Marbles +, some of which are, however, as hard as Oriental 
* Gravel-pits near London hold only common Quartz and Flint Pebbles of 
different sizes—see p. 88. 
+ Any largish stones, not Gems, are pominolky called Marbles. I think, 
however, that this name should be confined to such stones as masons can 
polish without Emery, as the Marble of Italy. 
D 2 
