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 justre silky. The 
fascicled was bluish white. 
. ASBESTOS. 
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 Biren: Phos te in Windsor——dark grays and 
with stiff fibres. Porte 
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 oceurs often in four 
sided prisms, rather flat, yellowish white, and like that at 
Kingsbridge, N.Y. These prisms are sometimes canes 
ted on their edges. Also in six sided prisms. Som 
the flattened prisms so much resemble those of eoeectls, 
