112 
NATURAL HISTORY. 
[long 
zil, and in the chlorite slate of that neighbourhood ; — 
chrysoberyl or cymophane, among the specimens of which 
may be specified those in a matrix of quartz and feldspar 
with garnets, from Haddam in Connecticut, and also those 
from Saratoga and New York ; helvine , a substance which 
is considered by some as a triple silicate of glucine, iron 
and manganese. In this Case are also placed the speci¬ 
mens of lazulite or lapis lazuli, (which furnishes the 
valuable pigment known by the name of ultramarine,) 
massive and exhibiting planes of the rhomboidal dodecahe¬ 
dron ; the hauyne , and a few other of the imperfectly 
known silicates of alumina, soda and lime combined with 
sulphates : such as the spinellane, &c. 
Case 38. In this Case are provisionally placed (be¬ 
sides sodaliie , eudiolyte , and pyrosmalite , substances which, 
being chloriferous, may perhaps be referred to the chlo¬ 
rides, Case 60) the suites of tourmaline and shorl , many 
varieties of which have been found to contain boracic acid. 
Among those here deposited are, the rubellite , also called 
siberite (tourmaline apyre of Haiiy), a specimen of which, 
remarkable both for size and form, is that in the centre of 
the Case: it was presented by the king of Ava to the late 
Colonel Symes, when on an embassy to that country, and 
afterwards placed by the latter in the Hon. Charles Greville’s 
collection ; other red and blue varieties, chiefly from Siberia 
and from Massachusetts in North America ; the flesh- 
coloured tourmaline, from Rozena in Moravia; the dark 
green, called Brazilian emerald; the asparagus-green 
variety in dolomite, from Campo Longo ; varieties of com¬ 
mon shorl;— axinite , in most beautiful crystals, from 
Bourg d’Oisans in Dauphiny, from Norway, &c. 
Case 39. The silicates terminate in this glass Case, 
with the topaze and chondrodite, two species which, from 
their chemical composition, might be classed with the 
fluorides (in Case 59);—among the specimens of topaz 
here deposited may be specified a series of crystals of 
Saxon, Brazilian, and Siberian varieties, among which 
there are several new modifications; Saxon varieties im¬ 
bedded in the topaz rock, an aggregate of topaz, shorl, 
quartz, and sometimes mica ; fine Brazilian topazes, yel¬ 
low’ and pink, imbedded in rock crystal, &c.;—also the 
pyrophysalite from Fahlun in Sweden, and the pycnite % 
