50 
ROOM VIII. of the three usual constituent parts, (a fragment of 
Nat, Hist, the immense mass of granite conveyed from the 
bay of Finland to St. Petersburg}!, and now form¬ 
ing the base of the equestrian statue of Peter the 
Great); granite in several stages of decomposition; 
new or regenerated granite from the Hartz, &c,; 
binary aggregates, called Granitels by some 
authors, (graphic stone from Scotland, Sweden); 
granite mixed with other minerals, such as com¬ 
mon shorl, garnets, actinote, chlorite; large po¬ 
lished pieces of granitic rocks, some of them passing 
over into sienite and porphyry;—gneiss of various 
approximation to granite on one side, and to mica¬ 
ceous shistus on the other ; gneiss with garnets, 
shorl, &c.—micaceous shistus ;the same approach¬ 
ing gneiss on one hand, and clay slate on the other, 
(silvery variety of the latter, used for roofing 
in Thuringia). 
CASE (Shelves 4, 5, Q.) Oldest or primitive clay slate 
5. of several colours; variegated slate. Subordinate 
beds in clay slate; novaculite or whet slate, chlorite 
slate, drawing slate, better known by the name of 
black chalk ; flinty slate and Lydian stone ; an- 
thracoiite or kohlenblende,—r Transition slate, 
mostly from the Hartz mountains, (a specimen, 
in which it is seen in immediate contact with grey 
wacke, a transition rock of the nature of old 
sandstone).—Grey-wacke, fine and coarse gi’ain- 
ed 
