GALLERY.] 
NATURAL HISTORY. 
177 
Case 53. Arsenious acid and arseniates : the former 
(also called arsenic-bloom , or octahedral oxide of arsenic) 
is frequently confounded with arseniate of lime,, and the 
white octahedral crystals* often seen in collections, on 
realgar and orpiment, are generally artificially produced in 
the interior of mines.—Of arseniates we have in this glass- 
case :— arseniate of lime, called pharmacolite , chiefly in 
white acicular crystals, from Wittichen in Suabia, and 
Kiegelsdorf in Hessia. — Arseniate of iron or pharmacosi- 
derite , which occurs only crystallized, chiefly in cubes 
(whence Werner’s name of cube-ore), from Cornwall, from 
San-Antonio-Pereira, Brazil, on hydrous oxide of iron, 
&c.;— skorodite, a substance which appears to be closely 
allied to Bournon’s martial arseniate of copper.— Arse¬ 
niates of copper , consisting of the foliated arseniate or 
copper-mica, the lenticular arseniate or lentil-ore, and the 
olive-ore of Werner, which are formed into five species by 
Bournon, and probably admit of further subdivision. To 
these also belongs the kupferschaum of Werner, at least 
that from Falkenstein in Tyrol: for some other varieties 
appear to be referable to carbonate of zinc.— Arseniate of 
cobalt, or red cobalt ore, comprising the earthy ( cobalt- 
crust ) and the radiated ( cobalt-bloom ) varieties, from Sal- 
feld, Allemont, &c.— Arseniate of lead from Corn wall,Nert- 
chinsk in Siberia, Johanngeorgenstadt in Saxony, &c. 
Case 54. This, and part of the next Case, contain the 
phosphates: among the phosphates of lime m ay be speci¬ 
fied several very scarce and interesting crystallizations of 
Werner’s apatite, such as the large violet-coloured crystals 
from St. Petersburg; the groups from Ehrenfrieders- 
dorf, Maggia on St. Gothard, Traversella in Piedmont, 
&c.; the variety called asparagus-stone, particularly the 
specimens from Jumilia in Murcia ; the Norwegian apatite 
called moroxite ; also the phosphorite or fibrous and com¬ 
pact phosphates of lime, and the pulverulent variety, 
known by the name of earth of Marmorosh, and which 
was formerly considered as a variety of fluoride of calcium 
(fluate of lime).— Phosphate of lead , or pyromorphite, gene¬ 
rally divided into brown lead ore and green lead ore : 
among the varieties of the former, the more remarkable 
are the large six-sided prisms from Huelgoet in Brittany ; 
of the latter we have the massive botryoidal ( trauben - 
