Geology and Mineralogy of a part of Massachusetts, $e. 49 
25. AMIANTHOIDE ? 
minute fibres, associated with actynolite, idocrase, 
and hornblende——fusible into a dark dull enamel. Emmons. 
1 mention this mineral to _— attention to it. It may be 
fibrous actynolite, and it may be amianthoide. The two 
seem to be closely related, se do not differ very greatly 
in their composition. 
26. DIALLAGE? 
In Diallage rock? Chester. It resembles metalloidal 
diallage. It differs so much from hornblende in its gene- 
ral appearance, that I suspect it to be diallage. In the 
serpentine of Middlefield is a foliated mineral in small 
quantity, which seems to be metalloidal diallage, though it 
is rather finer grained than the European which I 
seen. 
27. SERPENTINE. 
In immense quantities in a bed two miles bog in Mid- 
diefield, two miles south of the meeting-house. [1 often 
ms ledges from 50 or 80 feet in height, and is of various 
colors, light and a green, and dark reddish brown . 
specimens from England. In a neighboring brook, it 
white and cream'colored, sometimes spotted, traadhdeeit, 
and beautiful. Both precious and common serpentine are 
found here. The green and brown are acted upon by the 
weather, and the surface becomes of a reddish yellow 
color, and they sometimes disintegrate into a reddish earth. 
The rocks break into angular fragments, with an obvious 
tendency in many cases to prismatic forms. In Russell, a 
little east of south from this place, it occurs in large beds, 
of avery dark green, nearly black, and has been polished 
(See A 
steatite. * Serpeine is ond also in the N. W. part of 
Vor. VII? 
Mo. Bot.Garden, 
1901, 
