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plagioclase feldspar
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Sun Apr 30 2000 at 11:08:22
A type of
feldspar
with chemical formula ranging continuously from AlSi
3
NaO
8
(
albite
) to Al
2
Si
2
CaO
8
(
anorthite
). Plagioclase feldspar has a complicated
phase diagram
with several different
order
ed states. Anorthite's low temperature ordered state is an alternating
pattern
of Al and Si atoms, but albite has a different ordering pattern, which cannot be created from anorthite's by replacing Al atoms by Si. Albite also has a displacive
phase transition
- this is a phase transition where the atoms do not swap places but the shape of the unit cell changes. In between albite and anorthite, there are more complicated ordered states known as
incommensurate
structures.
printable version
chaos
Phase diagram
Plagioclase
spectrolite
Incommensurate
Mafic
Feldspar
Albite
Anorthite
phase transition
IUGS classification of plutonic igneous rocks
Aventurine
order parameter
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