58 Geology and Mineralogy of a part of Massachusetts, &c. 
ll. SULPHURKET OF MOLYBDENA. 
In beautiful plates or nine ae brilliant lead colour, 
and less dark than foliated plumbago have some regu- 
lar hexaedral plates, which were closely united, forming a 
six sided prism, in quartz. Chesterfield. 
12. RED OXIDE OF TITANIUM. 
In small prisms in quartz associated with Dolomite ia 
Pittsfield—rare. Also in flat plates in quartz in Middlefield ; 
Emmons. 
gets 
13. FERRUGINOUS OXIDE OF TITANIUM. 
It has some resemblance to schorl; but is infusible—oc- 
curs in smallish long ao. nearly black prisms in gran- 
ite—rare. Chester; Emmon 
14. sILICO-CALCAREOUS OXIDE OF TITANIUM. 
In Middlefield in imperfect prisms, rather lighter colored, 
but much resembling that of Brattleborough, Vt. 
MINERALS OMITTED. 
Anthracite: 
This mineral is found in small quantity in gray wacke 
slate, especially at Schuyler’s quarry, Troy; Eaton. 
Vert Antique ? 
This is a magnesian mineral found in a bed in gneiss on 
the river in. Becket, and colored greenish by serpentine. 
It may, as Dr. Emmons supposes, be a serpentine marble. 
It is a tough mineral, and takes a fine polish. In some 
