200 
PROCEEDINGS OF 
sometimes without a central spot corresponding with the shape of the crystal, of a 
different tint or texture from the rest. One or two of these that I send, have a 
reddish tinge in the gray, and I have conjectured that some more strongly tinged 
varieties of this kind may have induced Dr. Jackson to speak of them as anda- 
lusite ; to which, otherwise, I have seen no resemblance in any crystals I have ex¬ 
amined. Andalusite is usually hard enough to make a slight scratch upon quartz ; 
while these grayish crystals may be cut or scraped with the point of a knife. This 
variety also affords instances of intersection. 
As a fourth variety, I have ranked those described as resembling granatite in 
external characters, other than the hexagonal shape and crossing. In some of 
these, while the texture of the crystal seems tlie same, the insertion of the internal 
crystal, and the connecting lines of the angles, are distinctly marked by a light 
furrowed line, as of a joining. Some variety of this kind may be that of which 
Dr. Jackson speaks. He obtained his specimens from a locality several miles dis¬ 
tant from me, and which I have never examined. 
SPECIMENS. 
In Package No. 1.—These are specimens of the most perfect form, having the 
Inner crystal distinctly marked, with the diagonal joinings, and the appearance of 
duplicature of the outer investment to form the longitudinal diagonal. One of the 
specimens is triangular, being half of a crystal divided in its natural cleavage 
through the transverse diameter. Another is divided obliquely lengthwise, and two 
black lines may be observed traversing the crystal diagonally lengthwise. 
Package No. 2.—This contains specimens of those described as the second 
variety, from the perfect form of those in No. 1, to a more central spot of the yel¬ 
lowish matter, and two handsome specimens of the mottled kind. One of these 
specimens, with a central dot, is an imperfect six-sided prism, and is half of one 
<of the crystals of a stauroidean formation. The remainder of the cross accom¬ 
panies this package. 
Package No. 3.—Specimens of the gray and blackish variety, without any en¬ 
closed yellowish matter, but one or two of them with a darker nucleus, similar in 
shape to the external crystal. One of the gray crystals is an instance of an oblique 
intersection. This specimen is split longitudinally, and shows one crystal passing 
through the other. 
Package No. 4.—Specimens of the dark reddish, brown variety, very hard, 
brittle, and difficult to be detached from the matrix. One of them has a perfect 
formation ; in the others it is not to be discovered. 
Quere .—Are not these last crystals radically distinct from the others, and even 
from the perfectly shaped one with them ? 
All of the crystals that I have seen, have been found in the detached masses 
-spoken of. I have never met with them in any ledge, though others have told me 
that they have found them so. I have fancied, from my own observation, that they 
mistook the projection of some huge half-buried fragment for the outcropping of 
sfrata, as they were persons of little experience in such researches. 
