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It
was
found
that
it
was
desirable
to
rewrite
the
book,
and
consequently,
as
far
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minerals
which
it
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principles
of
the
subject.
A
crystal
has
been
defined
fundamental laws
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form
which
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ISOMETRIC SYSTEM
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The
name
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tetra-
hexahedron
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hedron had
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zontal
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follows:
1.
Prism
of
form
consisting
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HEXAGONAL SYSTEM
^~
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HEXAGONAL SYSTEM
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is
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the other two
to
which
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a
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crystals
the
follow-
ing
terms
may
be
used:
a.
Crystallized.
In
definite
crystals
(see
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mineral
can
be
split
into
exceedingly
thin
sheets,
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any
peculiar
structure
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a
parting.
This
phenomenon
resembles
cleavage,
but
is
to
be
distinguished
from
it
by
the
facts
that
not
every
specimen
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specimen
to
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a
very
convenient
and
quite
accurate
method
of
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light upon
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would
be,
galena,
PbS,
with
a
bluish
gray
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color
in
their
different
specimens.
This
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of
the
surface
differs
from
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III. CHEMICAL
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these
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to
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other
in
the
molecule
is
obtained,
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over,
losing
its
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which
is
listed
as
3
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tube
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TESTS FOR
presence
of
magnesium
(see
page
103);
Barium
Hydroxide,
Ba(OH)
2
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two
parts.
To
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molybdate
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separating
as
the
dioxide,
Si0
2
frequently
complicated
by
the
presence
of
lead,
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heated
intensely
by
the
blowpipe
flame,
the
burning
in
the
flame
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and
characteristic
associations.
The
localities
at
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known
a
stone
which
has
its
upper
surface
covered
with
small
triangular
facets.
Its
lower
surface
may
be
one
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a
Greek
word
meaning
masculine,
a
term
first
applied
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occurring
in
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sulphate.
Determined
chiefly
by
its
high
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pure,'
and
green
when
nearly
so.
Commonly
yellow,
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bead
reddish
brown
(nickel).
Closely
resembles
pyrrhotite
in
appearance
but
to
be
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give
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steel-gray
to
grayish
black.
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Found
in
some
quantity
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more
than
10
per
cent
of
the
rock
mass.
The
impure
corundum,
known
as
emery,
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Occurs
as
thin
plates
and
dendritic
growths
between
plates
of
mica.
Often
inti-
mately
associated
with
corundum,
forming
the
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alloy
of
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a
small
extent
in
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bluish
green
opaque
bead
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limonite.
Diaspore.
Composition.
AIO(OH)
or
A1
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PLATE VII.
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(15
per
cent).
Charac-
terized
chiefly
by
its
structure
and
yellow-brown
streak.
Occurrence.
Limonite
acid
which
they
contain.
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meaning meadow,
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crystallization.
All
of
them
appear
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together.
Fused
feldspar
also
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molecule,
CaAl
2
Si
2
8
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formation
of
a
jelly.
Addition
meaning
white.
Pollucite,
H
2
Cs2Al
2
(Si03)
6
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thought
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low
clinodome
(Figs.
304
and
305).
Structure.
In
crystals.
Often
bladed
and
frequently
in
radi-
ating
columnar
aggregates.
Sometimes
in
silky
fibers.
Coarse
to
fine
granular.
Compact.
Physical
Properties.
Perfect
prismatic
cleavage
at
angle
of
125,
often
yielding
a
splintery
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grayish
green.
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TOPAZ 255
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a clear
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pyra-
Fig
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Bourg
d'Oisans
in
Dauphine;
St.
Just,
Cornwall;
Obira,
Japan;
Franklin
Furnace,
New
Jersey,
etc.
Name.
Derived
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most
common
and
charac-
teristic
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a
jelly.
Solu-
tion
gives
little
or
no
precipitate
with
ammonia
but
gives
an
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ANALCITE 269
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color
of
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beautiful
variegated
coloring.
Frequently
called
verd
antique
marble.
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manganese.
Tri-
phylite
corresponds
to
LiFePO
4
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coal
gives
a
globule
which
on
cooling
shows
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sodium
in
small
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mineral
and
then
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their softness.
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by
a
brief
general
discus-
sion
of
given
in
it
and
by
a
short
statement
The usual
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small
amounts
in
casting
steel
in
order
to
take
up
in
welding
iron
and
steel.
Sheets
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from
the
smelting
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as
linings
for
metallurgical
furnaces.
Various
red,
orange
and
green
pigments
and
dyes
by-product.
The
only
source
of
cobalt
at
present
in
the
United
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undergone
secondary
enrichment,
and
replacement
veins
in
a
granitic
rock.
The
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in
Sonora,
etc.;
in
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discussion of
the occur-
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yellow
and
red
paints.
Lead
acetate,
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them.
The
important
ores
of
silver
can
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materials
in
fluxing
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which
permitted
some
crystals
to
grow
to
considerable
types.
II.
Sedimentary
Rocks.
Sedimentary
rocks
are
secondary
in
their
origin,
the
materials
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a
a soft
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are not elastic.
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ACCESSORY ROCK-MAKING
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open up
rock material must
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mineralogy. Pegmatite
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VEINS AND
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oxidized
compounds
and
include
the
following:
cerussite,
PbC0
3
, anglesite,
PbS0
4
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Classification of the
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by
the
that
the
cent
cannot
could
be
closely
deter-
mined,
would
frequently
be
of
great
assistance
in
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SUBMETALLIC LUSTER.
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METALLIC OR
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METALLIC OR
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METALLIC OR
II. Can
be scratched
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obtained
in
the
nature
total
production
is
comparatively
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471/497
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472/497
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474/497
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in
the
United
States
in
recent
years.
The
value
of
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