40 Geology and Mineralogy of a part of Massachusetts, §. 
tionsof it, polished, aren be very beautiful. This may 
be agate jasper. Jameso 
The crystals of qullagia in the mine at Southampton often 
project froma base of agate. The bands are zigzag, like 
those in fortification agate, and seem to be quartz of different 
colours, or quartz passing into chalcedony, often beautiful. 
2. FIBROLITE ? 
Beket. This mineral is in minute fibres, harder than 
quartz, dark coloured, infusible. Occurs only in small — 
quantities, and is nearer Fibrolite 7 aa I can find. | 
aides 
. 3 CYANITE. hy 
[In mica-slate in Chester, quite | common. A darker 
_variety than the common is in da mica-slate, generally 
in single prisms. Emmons. Also in Blanford and Granville. 
This mineral is sbGhdanti in this section. ge a it 
is disintegrating, and is recogningll hae atigy 
4, srapaoripit 5 ee 
Very common in the towns about Middlefield. Prisms 
sometimes three inches long; and with Cyanite and Gar- 
net, it constitutes the. greater part in some mica-slate. Em- 
mons. Also in Sheffield, Salisbury, &c. 
5. TOPAZ? 
In Middlefield, connected with serpentine are very y small _ 
crystals or fragments, some of them prismatic, and tetrae- 
dral, of a yellow colour, brittle, and harder than rock erys 
Unless they are an uncommonly hard variety of 2 4 
quartz, they are topaz, which they much resemble . They , 
=e in an earthy ground of some diseetae 
4 
rals, Z| 
+ 
