Beaumontite and Lincolnite ia Ul with Heulandite. 235 
This is the only respect in ° the Heulandite from Nova 
Scotia, and M. Levy’s min 
in reference to this single peculiar ty in the approximation of the 
crystals of the Nova Sap! ia ral to a right square prism, that 
it has hitherto commanded an especial interest among our miner- 
alogists the decrement carried so completely 
out in the crystals from any other locality, until these beautiful 
Specimens met my eye from Baltimore. The smaller replace- 
i often seen in the crystals of this mineral 
_hever observed among the epenimona from 
ne United States.* 
To remove all doubt as to the identity of the two minerals, I 
requested Mr. J. E. Teschemacher to separate some of the best 
crystals from my Baltimore specimens, and subject them to meas- 
urement by the reflecting goniometer, as I well knew the public 
would have the fullest confidence in his use of that instrument. 
He has informed me that P on P gives 90°, Mon T 130°, M ona 
143° 17’, P on a 111° 58’, and adds that he has no doubt the 
mineral is Heulandite. 'The variation in the third measurement 
was owing to the imperfection of the surface. We have, there- 
fore, every reason for believing that the specific nature of the 
Beaumontite of M. Levy, can no longer be maintained. It is 
proper to add, that the same name, in honor of a distinguished 
French naturalist, Elie de Beaumont, had already been applied 
to another mineral from Chessy in France, described and analyzed 
by my friend Dr. Charles 'T’. Jackson.t+ 
Lincolnite.—Prof. Hitchcock in his Final Report on the Geolo- 
gical Survey of Massachusetts, (p. 662,) has given the descrip- 
tion of a mineral found in the vicinity of Deerfield, which he has 
named in honor of the late governor of that state. Unfortunately, 
it must share the same fate with Beaumontite, though it seems less 
entitled to the distinction of a new species; for in every respect 
ult one, viz. its not being replaced on the obtuse solid angles by 
the lines a, as shown in fig. 1, it is impossible to discover any 
dissimilarity between this giineril and Heulandite ; both exhibit- 
ing the same characters before the blowpipe, the same color, lus- 
tre, hardness, &c. The crystals of Lincolnite are very small, 
* See fig. 2 in Phillips’ Mineralogy, Allan’s edition, p. 25. 
t American Journal of Science, Vol. xxxv1r, p. 398. 
