213 
Ninth species. Black iron-stone. 
Compact black iron-stone, is of an inter- 
mediate colour between bluish-black, and 
dark steel-grey: it occurs massive, tuberose, 
yeniforni, &c. is semihard, brittle, easily 
frangible, and heavy. 
Tenth species. Clay iron-stone. 
■Reddle is of a .light brownish-red, passing 
into cherry-red : it occurs only massive ; soils 
strongly, and writes, is sectile, easily fran- 
gibie. and rather heavy. It is chieily found 
in the newer clay-slate, and is produced 
pretty abundantly in Germany 'and Siberia. 
The coarser varieties are used by the car- 
penter, the liner by the painter,, under the 
name of red-chalk. 
Eleventh species. Bog iron-ore. 
Morass ore is of a yellow-brown colour, 
sometimes friable, sometimes coherent, and 
occurs massive, corroded, in grains, and tu- 
berose. It soils pretty strongly, feels meagre 
but line, and is lightish. 
Twelfth species. Blue iron-earth. 
When fresh it is whitish, but soon becomes 
of an indigo-blue colour, of different degrees 
of intensity; it occurs massive, disseminated, 
aad thinly coating; the particles are dull and 
dusty; it soils slightly, feels tine, and is light- 
ish. It is found in nests in clav-beds, and 
other situaions, in the Shetland isles, Ice- 
land, Sweden, and Siberia. 
Thirtee nth species. Green iron-earth. 
Friable green iron-earth is ot a siskin-green 
colour, occurs massive and disseminated, is 
more or less cohering, soft, line, easily fran- 
gible, and intermediate between particularly 
heavy and heavy- 
Fourteenth species. Cube ore. 
The colour is olive-green, oi different de- 
grees of intensity ; it occurs massive, and 
chrystallized in. small cubes, is translucent, suit, 
brittle, and not particularly heavy. It is 
found in veins,, but hitherto only in Corn- 
wall. 
Seventh Genus. Lead. 
First species. Lead glance. 
Common lead glance is ot a fresh lead- 
grey colour, of different degrees of intensity ; 
si occurs massive, disseminated, in mem- 
branes, &c. and also chrystallized in cubes, 
octahedrons, four-sided prisms, six-sided 
prisms, and three-sided tables, it is solt, 
sectile, externally easily frangible, and un- 
commonly heavy ; and is found in veins and 
beds in primitive, transitive, and iloetz moun- 
tains, at lead-hills in Lanarkshire, Derby- 
shire, and several other counties ot England, 
Scotland, and Wales ; besides being widely 
diffused over other parts of the globe. It is 
most frequently worked as an ore ot lead,, but 
sometimes as an ore of silver. 
Second species, Blue-leacl ore , 
Is of an intermediate colour between dark 
indigo-blue and lead- grey ; it occuis mas- 
sive, and chrystallized in perfect six-sided 
prisms, is soft, sectile, easily frangible, and 
heavy, and is found in veins with other mi- 
nerals of the same class, but is altogether a 
rare fossil, nor has it hitherto been discovered 
in Britain. 
Third species. Brown-lead ore. 
Is of a hair-brown colour of different de- 
grees* of intensity; it occurs massive, and 
mineralogy. 
chrystallized in six-sided prisms, is feebly 
translucent, soft, not very brittle, easily fran- 
gible, and intermediate between heavy and 
uncommonly heavy. It is found in veins, 
accompanied with other minerals, in Bohe- 
mia, Hungary, Brittany, and Saxony. 
Fourth species. Black-lead ore. 
The colour is greyish-black, of different 
degrees of intensity ; it occurs massive, disse- 
minated, and chrystallized in six-sided pi isms; 
externally is usually splendent, internally 
slw.nin°* with mi cid&iruuitinc lustre, is ldthei 
brittle” easily frangible, and heavy. It is 
found in veins, and almost always accompa- 
nied with other kinds ot lead ore, at lead-hills 
in Scotland, in Bohemia, Saxony, and other 
mineral countries. 
Fifth species. Whitt-lead ore. 
The colour is white, but has various shades; 
it occurs massive, disseminated, in mem- 
branes, but most commonly chrystallized in 
prisms and p \ ramids, or different iigures. 
Externally, it" is specular splendent, inter- 
nally between splendent and glistening, with 
an adamantine lustre. It is soff, brittle, very 
easily frangible, and heavy, and is found in 
most" 1 places where the other species occur, in 
England, Wales, Scotland, Ireland, &c. 
Next to lead glance it is the most common of 
the lead ores, but is seldom in sufficient 
abundance to become an object to the metal- 
lurgist. 
Sixth species. Green-lead ore. 
Its colour is grass-green, of various shades; 
it generally occurs chrystallized, in six-sided 
prisms, is always translucent, soff, lathei 
brittle, vfery easily frangible, and heavy. ^ It 
is produced in Scotland and other countries, 
and is sometimes confounded with the pie- 
ceding species. 
Seventh species. Red-lead ore. 
Its general colour is a hyacinth-red ; it oc- 
curs massive but rarely, sometimes in mem- 
branes, but most commonly chiystullized in 
broad oblique four-sided prisms, is both ex- 
ternally and internally splendent, very soft, 
between brittle and sectile, easily frangible, 
and heavy. It is found in veins in gneiss and 
mica slate, accompanied with other fossils ot 
the same kind, in Austria, Savoy, and Sibe- 
ria, and on account of its beautiful colour is 
chieily used as a pigment. 
Eighth species. Yellow-red ore. 
Its principal colour is wax-yellow; it is 
generally chrystallized in rectangular four- 
sided tables, cubes, octahedrons, equiangular 
eight-sided tables, and double eight-sided 
pyramids. Externally, it is shining and 
smooth, internally glistening, with a resinous 
lustre; it is translucent, soft, between brittle 
and sectile, easily frangible, and heavy. It 
is found in compact lime-stone in Gaiinthia, 
and some other countries of the continent. 
Ninth species. Lead vitriol , or vitriol of 
lead. 
The colour is yellowish-grey and greyish- 
white; it occurs only chrystallized in octahe- 
drons of different Iigures. Externally it is 
shining, internally splendent, with an ada- 
mantine lustre. It is often semi-transparent, 
rather brittle, and heavy, and is found in 
Scotland, Anglesea, and Spain,. 
Tenth species. Lead earth. 
Coherent lead earth is usually of a yellow- 
ish-grey colour; it occurs massive, is inter- 
nally glimmering, usually opaque, soft, in- 
clining to sectile, easily frangible, and'heavy. 
It is found in primitive lime-stone in Derby- 
shire, Scotland, and many other countries. 
Eighth Genus. Tin. 
First species. Tin pyrites. 
The colour is intermediate between steel- 
grey and brass-yellow; it occurs massive and 
disseminated, internally is glistening, and lias 
a metallic lustre, is semihard, brittle, easily 
frangible, and heavy. It melts easily, and 
.lias hitherto been found only in Cornwall. 
Second species. Tin stone. 
The most common colour is blackish- 
brown; it oecurs massive, disseminated, in 
rolled pieces, in grains, like sand, but most 
frequently chrystallized in prisms and pyra- 
mids of different Iigures. Internally it is 
shining and glistening, it yields a greyish- 
white streak, is hard,; easily frangible, brittle, 
and very heavy. It is found only in primi- 
tive rocks, and is confined to: a few situations,, 
like ail the tin genus. 
Third species. Cornish tin ore, or woodtin , 
The most usual colour is hair-brown, of 
different degrees of intensity ; it occurs usu- 
ally in rolled pieces, sometimes reniform with 
impressions, it is found usually m large and 
coarse granular distinct concretions, is opaque,, 
hard, brittle, easily frangible, and uncom- 
monly heavy. It is infusible, and hitherto, 
has only been found in Cornwall in alluvial 
land, accompanied with tin stone. 
Ninth Genus. Bismuth, 
First species. Native bismuth 
Its colour is silver-white, with an incli- 
nation to red ; it occurs massive, dissemi- 
nated in leaves, reticulated, and chrystallized 
in small four-sided tables, and in small and 
indistinct cubes, and three-sided pyramids. 
It is soft, sectile, ratiier difficultly frangible, 
and uncommonly heavy ; and is found in 
veins in primitive mountains in Saxony, and 
other parts of the continent ; but it is doubt- 
ful if produced in Britain. 
Second species. Bismuth glance ,• 
The colour is a light lead-grey ; it occurs 
massive, disseminated, and in acicular and 
capillary chrystals ; it soils, inclines to sectile,. 
is easily frangible, and heavy. It is found, 
always in veins, and is usually accompanied 
with native bismuth, chiefly in Saxony, Bo- 
hemia, and Hungary. 
Third species. Bismuth-ochre, 
The colour is a straw-yellow, passing into, 
other neighbouring shades ; it is massive and 
disseminated, opaque, soft, not very brittle,, 
easily frangible, and heavy. This mineral 
is rare, and seems to be confined to a few 
places in Saxony and Bohemia. 
Tenth Genus, Zinc, 
First species. Blende. 
Yellow blende is of a dark wax and sul- 
phur yeliow colour ; it usually occurs mas- 
sive and disseminated, but is sometimes chrys- 
tallized in rectangular four-sided prisms ; it 
is shining and splendent Mb externally and 
