115 
negative metallic, substances (metalloids), and their not 
oxidized combinations.— Tellurium and tellureis: the 
scarce native tellurium , which (like sulphur and sele¬ 
nium, &c.) has the property of mineralising several 
metals, combining with them as electro-negative sub¬ 
stance: with bismuth (formerly called molybdena-silver, 
and considered by Esmark as native tellurium); with 
lead (foliated tellurium, or nagyag ore); with silver and 
lead (white and partly yellow tellurium); with silver 
and gold (graphic tellurium or schrift-ertz of authors).— 
Native antimony from Dauphiny, and antimomal silver 
or stibiuret of silver from the Hartz, &c. 
Case 4. Native arsenic (formerly called testaceous or 
scherben-cobalt) in reniform and botryoidal shapes, from 
Andreasberg, &c., and its chemical combinations (arse- 
niurets): with nickel (commonly called copper-nickel); 
with cobalt , comprising the grey and part of the white 
cobalt of some mineralogists; with bismuth , called bis¬ 
muth-blende, in small hair-brown globules from Schnee- 
berg in Saxony: a scarce mineral substance which, ac¬ 
cording to Kersten, is a silicate of bismuth. 
The remainder of this Case contains the substances be¬ 
longing to the confined orders of Carbonnwdo^Selenium . 
To the former are referred the diamond, anthracite, gra¬ 
phite ; to the latter the selenium metals or seleniurets. 
Among the specimens selected to illustrate the crystalline 
forms of the diamond are:— the primitive regular octahe¬ 
dron; the same with solid angles truncated; with edges 
truncated, forming the passage into the rhombic dodeca¬ 
hedron; varieties of the latter, giving rise to the six-sided 
prismatic and the tetrahedral forms; cubes with trun¬ 
cated and bevilled edges ; various hemitropic crystals or 
macles of diamonds; an octahedral diamond, embedded 
in gold; another in its usual matrix; models of the 
largest diamonds known, &c. With these are placed 
specimens of the alluvial rock in which this precious 
substance occurs in the East Indies and in Brazil.— 
Specimens of anthracite or kohlenblende (to which may 
be referred the Kilkenny coal), with native silver from 
i Kongsberg, 
LONG 
GALLERY. 
Nat. Hist. 
