LIME. 
247 
at Bergen hill. Crystals of the primary form (Fig. 119), and very complex secondary ones, 
have been found here in considerable abundance. They sometimes very nearly resemble 
those of calcareous spar, occurring at the same locality, and the latter have probably often 
been mistaken for them. The different action of acids forms a good distinctive character. 
Datholite is also found in the trap at Paterson, and in other parts of New-Jersey. 
Westchester County. Small crystals, presenting the primary form slightly modified, 
have been found in veins of calcareous spar, with analcime and iron pyrites, in the gneiss near 
Yonkers. They are, however, of rare occurrence. 
According to Prof. Shepard, the variety Humboltite occurs in trap at Middlefield and Ham¬ 
den, Connecticut. 
PHARMACOLITE. 
[From the Greek (pap^axog, in allusion to its containing poison.] 
Chaux Arseniatee. Hauy .— Arseniate of Lime. Cleaveland .— Bisesquihydrous Arseniate of Lime. Thomson .— 
Hemiprismatic Gypsum-Haloide. Haidinger. — Hemiprismatisches Euklas-Haloid. Mohs. — Pharmacolite. 
Beudant, Shepard and Dana. 
Fig. 122. 
Description. Colour white or greyish white. It occurs in minute fibrous or acicular 
crystals, which are usually aggregated into botryoidal or globular masses; more rarely in 
distinct crystals. The primary form is aright oblique angled prism (Fig. 121). Fig. 122 
Fig. 121. represents one of the secondary forms : 
f on f 117° 24'; 6 to the edge between 
f and / 83° 14b Cleavage parallel to T, 
highly perfect, and easily obtained. Frac 
ture uneven. Lustre glimmering or silky. 
Transparent or translucent. Hardness 2.0 
to 2.5. Specific gravity 2.73. Before 
the blowpipe, it is almost entirely volatilized with a dense white arsenical vapour. In nitric 
acid, it dissolves readily without effervescence. 
Composition. Lime 25.00, arsenic acid 50.54, water 24.46 {Klaproth). 
In regard to this mineral, it may be remarked, that most of the above characters were 
obtained by Haidinger from a specimen which he supposed to come nearer to pharmacolite than 
to any other species. It was received by him under the name of selenite. His remarks are as 
follows : “ It is very likely not an entirely new species, but a variety of pharmacolite, now 
observed for the first time in crystals large enough to admit of measurement, and to allow the 
characters derived from hardness and specific gravity to be ascertained to a considerable- 
degree of exactness. The pharmacolite itself cannot be called a species which we know, 
since the whole of our information respecting its natural-historical properties is confined to 
its occurring in exceedingly delicate white capillary crystals, aggregated in globules, the 
specific gravity of which is 2.64. The lower specific gravity might perhaps be accounted 
