Geology and Mineralogy of a part of Massachusetts, &c. 47 
Var. 3. Baikalite ? 
On the dolomite of Sheffield, I found radiated and fasci- 
cled Tremolite, yellowish white, and lustre silky. The 
fascicled was bluish white. — PeAlny 
22. ASBESTOS. 
Var. 1. Amianthus. 
In very strong and flexible fibres in steatite, Middlefield. 
Emmons. Windsor—Porter. 
Var. 2. Mountain Cork. 
In fine specimens at Benington. _ 
Var. 3. Common. 
With the preceding-—also, in Windsor——dark gray, and 
with stiff fibres. Porter. 
Var. 4. Ligniform. 
White and yellowish white, fibres stiff and brittle, tra- 
versing serpentine in veins at Middlefield. Emmons. 
Var. 5. Compact. 
In Middlefield with serpentine. It is often so near both 
these minerals, as to render it difficult to determine to 
which it belongs, 
23. AUGITE. 
In magnesian limestone at Muddy Brook in Great Bar- 
rington and in New Marlborough. It occurs often in four 
sided prisms, rather flat, yellowish white, and like that at 
Kingsbridge, N.Y. These prisms are sometimes trunca- 
ted on their edges. Also in six sided prisms. Some of 
the flattened prisms so much resemble those of tremolite, 
