Geology und Mineralogy of a part of Massachusetts, &c. 53 
32. CLAY. 
1. Porcelain Clay. | 
In Savoy, in a bed three feet deep and of unknown ex- 
tent, several feet below the surface. Discovered in dig- 
ging for ore, connected with mica slate. It resembles the 
porcelain clay of Monkton, Vt. It forms a very cohesive 
paste, white, and crucibles moulded from it and burned in 
a common fire were sonorous when struck. It contains 
coarse particles of quartz, but when sifted, forms a very 
fine clay. 
Similar clay of a finer quality has been given me, and is 
said to be found in large quantity in Canaan, Ct. but I 
am unacquainted with the locality. Also in Plainfield; 
Porter. 
2. Potters’? Clay. 
Abundant generally. 
3. Lithomarge? 
A clay, much resembling Lithomarge, is found in the 
iron ore inthe W. part of Bennington. I saw none of it at 
the great orebed. 
4. Yellow Earth. 
When washed, a yellow ochre is deposited from the wa- 
ter. Williamstown. 
CLASS II. 
1. SULPHURETTED HYDROGEN GAS. 
In the hepatic waters mentioned in the Geol. Sketch. 
2. SULPHUR. 
Hinsdale, in cavities of a mica slate rock, consisting 
chiefly of quartz. It is a brown powder, from its mixture, 
