_ 
' Geology, &c. of the Connecticut. 213 
14, Sulphate of ‘Aleoisha and Potash. (Alum, ) In Ley- 
den, efflorescing on bastard argillite. Also in Convey on 
mica slate. : 
15, Ccaiece Quartz. 
1. Lind Quartz. At Grafton in Vermont, ‘remarkably 
pure. (Hail.). Also at Plaufield. (J. Porter.) Also in the 
veins of lead, &c. at Southampton and Leverett, and the 
copper veins in Greenfield, in six-sided prisms. At the lat- 
ter place it occurs with both the terminations perfect. Also 
in veins in sienitic granite, at Northampton. Also in ge- 
odes in greenstone at New-Haven, Berlin and Deerfield. 
Also in veins and geodes from one to ten inches diameter, 
in mica slate in Conwa The crystals are of every size 
from one tenth of an inch to two inches diameter, and occur > 
in vast quantities. In the same town fragments of crystals 
occur, as transparent as the quartz from Madagascar. : 
2. Smoky Quartz. At Torrington and Cornwall. (Brace.) 
Also at Plainfield and Brattleborough ? amorphous, 
3. Yellow Quartz. In crystals at the Southampton lead 
mine; of a honey yellow, resembling the Siberian topaz. | 
The coloring matter appears to penetrate the crystals. Al- 
so in small quantities at the lead mine in Leverett, 
4. Rose-Red Quartz. At Southbury, very abies (Sil- 
liman.) Also atChatham and East-Haddam. (7. D. Porter.) 
Also at Deerfield ; a single specimen in alluvial soil. 
Si ised Quarts At Plainfield. (J. bee Aso a at 
“obese in mica slate 
« Milky Quartz. = Litchfield. (Benes ) eset Cass 
eecion att Plainfield. (J. Porter.) The specimens that 
[ have seen of this way a they are scattered abundant- 
ly over the mica slate regiom west of Connecticut river,) are 
rather poorly uanbatioater seeming to be intermediate be- 
tween limpid and milky quartz. : 
