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This
site
examines
the
crystal
chemistry
of
some
common
mineral
groups,
including
garnet,
plagioclase,
pyroxene,
mica
(muscovite
and
biotite),
and
amphibole.
For
each
group,
the
topics
considered
include:
the
sites
in
the
crystal
structure
on
which
the
principal
substitutions
take
place,
the
typical
ranges
of
observed
composition
variation,
how
to
assess
the
quality
of
analyses
from
looking
at
the
...
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This
site
is
a
lecture
by
Dr.
Stephen
Nelson
from
Tulane
University
that
explores
the
32
possible
combinations
of
symmetry
operations
that
define
the
external
symmetry
of
crystals.
The
lecture
defines
the
six
crystal
systems
(triclinic,
monoclinic,
orthorhombic,
tetragonal,
hexagonal,
and
isometric)
and
explains
the
derivation
of
the
Hermann-Mauguin
symbols
(also
called
the
international
symbols)
...
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This site is a lecture from Tulane University that explores the symmetry observed in crystals. Topics covered include crystallographic axes, the crystal lattice, and unit cells. Tables and illustrations accompany the text.
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Choosing & Using this resource...
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This
site
provides
an
illustrated
lecture
from
a
geochemistry
course
offered
by
Dr.
Scott
Wood
at
the
University
of
Idaho.
Topics
include
crystal
chemistry,
ionic
substitutions
in
crystals,
weathering
(dissolution,
redox
reactions,
acid
hydrolysis,
and
kinetics),
the
solid
products
of
weathering,
and
the
chemistry
of
continental
waters.
The
lecture
presentation
may
be
downloaded
as
a
PDF
document
...
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Choosing & Using this resource...
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This
resource
provides
illustrated
lecture
notes
from
a
geochemistry
course
offered
by
Dr.
Scott
Wood
at
the
University
of
Idaho.
Topics
include
the
law
of
radioactivity
and
the
general
geochronometry
equation,
the
use
common
radioactive
decay
equations
such
as
K-Ar,
Ar-Ar,
Rb-Sr,
and
U-Th-Pb,
the
use
of
isochrones,
concordia
diagrams
and
discordia,
the
concept
of
"blocking
temperature,"
the
use
of
...
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This
site
provides
an
illustrated
lecture
about
ocean
chemistry
from
a
geochemistry
course
offered
by
Dr.
Scott
Wood
at
the
University
of
Idaho.
Topics
include
geochemical
processes
that
occur
in
estuaries,
halmyrolysis,
the
concept
of
residence
time
for
elements
in
the
ocean,
the
mechanisms
by
which
elements
are
added
to
or
removed
from
seawater,
carbonate
behavior
in
seawater
and
a
definition
of
...
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Choosing & Using this resource...
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This
site
is
a
lecture
by
Dr.
Stephen
Nelson
from
Tulane
University
that
discusses
the
various
nonstandard
forms
of
crystal
growth
that
are
characteristic
to
some
minerals.
Topics
include
twinning
(contact
and
penetration,
polysynthetic
and
cyclical),
the
origins
of
twinning,
and
twin
laws
in
the
triclinic,
monoclinic,
orthorhombic,
tetragonal,
hexagonal,
and
isometric
systems.
Various
types
of
polymorphism
...
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This site provides access to a number of visual resources and supporting material illustrating the concept of radioactive decay and its central role in radiometric dating. Visualizations include diagrams, graphs, static illustrations and photos. Resources found on this site are suitable for use in lectures and classes and may also be used as the basis for labs or other activities.
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Pedagogical help
Misconceptions:
Read (1)
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This
site,
maintained
by
Caltech,
is
a
tutorial
on
the
basic
principles
of
phase
equilibria.
Topics
covered
include
the
first
and
second
laws
of
thermodynamics,
equilibrium,
Gibbs
free
energy,
chemical
potential,
the
graphical
representation
of
equilibrium
conditions,
the
phase
rule,
and
univariant
and
invariant
assemblages.
Also
included
are
several
applets
that
show
the
results
of
changes
in
pressure,
...
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This
web
site
is
maintained
by
John
Winter
of
Whitman
College,
and
contains
31
PowerPoint
presentations
for
an
igneous
and
metamorphic
petrology
course.
The
course
and
the
lectures
are
keyed
to
his
text,
An
Introduction
to
Igneous
and
Metamorphic
Petrology.
The
PowerPoint
presentations
are
organized
by
chapter
and
contain
many
maps,
graphs
and
illustrations.
Each
chapter
is
a
separate
PowerPoint
file
...
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