+ “they: tied even been picked up in New Hampshire ; but their ge- 
ological eg or the character of the rock from which they 
originated, h d not been well understood until recently. Mr. Al- 
ger had ately visited a remarkable locality of this mineral, where 
a true vein, two feet or more in width, had been brought to light 
_.. in making a deép cut through a hill in Waterbury, on the line of 
. the Vermont eral Railroad. ‘The rock is a very tenacious tal- 
_, cose slate, sometimes passing into mica slate, and prevails to a 
eg ‘stent snout in this part of Vermont. Metalliferous veins are 
).). Tarely, contained in it, ak veins of quartz are common. he 
vein here referred to, consisted principally of common amorphous 
quartz, presenting internal cavities or druses, lined or studded 
Se with. projecting’ prismatic crystals, sometimes colorless and trans- 
_ parerit, hut more frequently of a smoky color, or brownish yellow 
. tint, (Cairngorm m.) he pure glassy white crystals, are but rarely 
penetrated by the acicular rutile, while the colored varieties abound 
‘with it, and seem in fact to owe the intensity of their color to 
the very prevalence of it through their substance. 
‘The rutile is sometimes grouped i in tufts of radiating — 
proceeding from a common point, rats shooting through the qua 
this being also the ordinary manner of its occurrence in the Bra. 
zilian specimens. ‘The direction of many of these diffused crys- 
tals in the position cate now occupy, would seem to show that they 
esi been subjected to some airless or P sped inmate, by 
a eee 
Bie se 
Pee 
Ownwards in the cavity of the vein at the time of their forma- 
tion; and thus the rutile, from its greater specific gravity, would 
Rae have a tendency to crystallize and extend itself downwards, rather 
in any other direction. Mr. Alger could not state from 
* Rutilated Quartz - Crystals Srom Vermont. 13 - a 
= observation at the locality, whether such was the fact.* * 
The- ‘appearance referred to is most marked in those crystals in 
Fe a rt aa ii 
* That mineral veins may owe their origin in many cases to ) electrical or electro- 
_ chemical muical agencies, has been wg Mat ce oem of Fox, Beequer : 
who by ingenious contrivances imitat ing thee » epend trp ch w ouand toe exist Bab 
in nature, have produced precisely similar results, even the Savaativn of various 
ies; but the gbiect has n with that direct application 
e of crystals, in their para repositories, 
as en sai ) with regard to Pe position of —. 
, especially in granite and allied rocks, may prove that the 
i 
tant circulation rig the earth have been yori agents in 
in which the ax she Sar lie, and the ¢ of cleay- 
, second eile aoe 
