FLOOR.] 
MINERALS. 
4 1 
the following observations the term "group " will be reserved to con- 
nect Minerals, whether individual species, series, or classes, which pre- 
sent such a community of physical and other characters as imparts to 
them a sort of family resemblance. 
Div. I. The Native Elements. 
In Cases 1, 2, 3, and the first half of 4, are arranged such of the Cases 1, 2, 
elementary forms of matter as are found occurring in nature in the tin- 3, 4 (i.) 
combined state. These native elements, which form but a small pro- 
portion of those the chemist has eliminated from the Mineral Kingdom, 
are arranged in sections, of which the first is that of the native metals 
and their alloys. 
Of the series of native metals crystallizing in the cubic system the 
various forms of Copper, Silver, and Gold are the most important ; and Cases 1, 2. 
crystals of these metals are exhibited, remarkable for the perfection 
of their forms, or conspicuous for their size. The crystallized copper 
from Siberia and from Lake Superior, the silver in crystals from 
Kongsberg and from Freiberg, as well as a fine octohedron of gold 
from Brazil, and two unique nuggets of crystallized gold from the Case 2. 
Maclvor Diggings, in Australia, and one from California, are espe- 
cially worthy of remark. Besides these, will also be seen native foil 
of silver and of gold : moss-like filamentary aggregations of copper 
and of silver; nuggets, and washed grains of gold, and specimens of 
all these metals, in which a simple crystalline form, by being repeated 
or prolonged along particular axes has built up dendritic, ramose, capil- 
lary, and other singular kinds of structure. Among the specimens of 
gold and of electrum, or argentiferous gold rich in silver, from Tran- 
sylvania, are some worthy of notice from the sharpness of their crystal- 
line forms. The rhombohedral series of metals includes an isomor- 
phous group — the Arsenoids — namely, Arsenic, Antimony, and Case 3 (i.) 
Bismuth, with which its crystalline form, rather than its chemical 
analogies, associates the rare native element Tellurium. 
Next to the metals are arranged the Metalloids, a section including Case 8 (ii.) 
the carbon group and the sulphur group. In the former, elemeutary 
Carbon is illustrated in its two allotropic mineral forms : Diamond and 
Graphite. Of the Diamond, a large and extremely choice series of 
crystals is exhibited, together with models of the most famous for their 
size and history of the specimens of this, the hardest and most resplen- 
dent of gems. 
Of Sulphur, the vast yellow crystals are among the most splendid of Case t. 
the mineral productions of the earth. The glazed front of Case 2 
contains specimens belonging to this division, of extraordinary size and 
beauty. , 
Div. II. Compounds of tiie Arsenoid and Thionid Elements. 
Leaving the native elements, we enter upon minerals which are the Cases 1 (ii. 
products of the chemical combination of the elements with each to 10 ^i.) 
