156 Intelligence and Miscellaneous Articles, 
“ The authors who have since mentioned this substance have 
merely repeated what has been stated by Cleaveland. Mr. Brooke, in 
his article on Mineralogy in the Encyclopaedia Metropolitana, classes, 
without assigning any reason, haydenite with heulandite. I will 
add what appears to me singular, which is, that in a work recently 
published in the United States, entitled a System of Mineralogy, 
by James Dana, and printed at Newhaven in 1837, no mention is 
made of this species, though in other respects the work appears to 
be pretty complete. 
The cause of our ignorance respecting the nature of haydenite, 
may be explained by the small number of specimens which have 
been brought to Europe. M. Levy then goes on to state that he 
had seen only three specimens of haydenite, and the account which 
he gives of it is as follows :■ — Haydenite is regularly crystallized ; the 
crystals have the form of a small oblique prism with rhombic bases, 
in which the incidence of the lateral faces is 98° 22', and the inci- 
dence of the base, on each of the lateral faces, is 96° 5'. The cry- 
stals are frequently macled. The axis of revolution, around which 
one of the two crystals forming the made is supposed to have turned 
1 80°, is perpendicular to the base of the primitive form, and the face by 
which the two crystals are united is parallel to the same base. The 
crystals are thickly grouped together, and a small portion only of 
each is isolated. I have observed no modification either upon the 
edges or angles, so that the relation between the sides of the base 
and the lateral edges remains undetermined. The crystals cleave with 
the same facility on every face of the primary form. The cleavage 
faces sometimes present an uneven surface on account of small dark 
spots, as if the substance had suffered incipient decomposition. The 
crystals are usually covered by a thin layer of hydrate of iron, which 
is readily detached by the knife, and the faces of the crystals thus 
exposed are sufficiently brilliant to be measured by the reflective 
goniometer. The colour of haydenite is brownish yellow or green- 
ish yellow ; the crystals are translucent and sometimes transparent, 
they are easily scratched by the knife, readily friable ; the hardness 
is nearly the same as that of fluor spar. The quantity detached was 
too small to admit of its specific gravity being taken.*’ — Lilnstitnt, 
BEAUMONTITE, A NEW MINERAL. 
This is a new mineral discovered by M. Levy. It accompanies 
haydenite, and is named in honour of M. Elie de Beaumont. It oc- 
curs in small brilliant crystals of a pearly lustre. Their form is that 
of a prism with square bases, terminated by obtuse pyramids. The 
summits of all the crystals are closely grouped. The incidences of 
the faces of the terminal pyramids, measured with Wollaston’s 
goniometer, are 132° 20' of the two faces, the intersection of which 
is parallel to one of the edges of the base of the primary form, and 
147° 18' of the two faces above, whose intersection is inclined to this 
base. One of these angles is a necessary consequence of the other. 
By calculating from the first, the second is 147° 28', instead of 147° 
18', as determined by experiment. The primary form of the beau- 
