Geochemists have discovered a new modification of feldspar

Scientists have discovered
what if you squeeze a sample of feldspar up to a pressure of the order of 9-11
GPA,
it
the crystal lattice is compacted,
and coordination number of aluminium
and silicon in it is increased from four to
five or six.
New
modification
spars
stable
when
temperatures up to 600 degrees Celsius and
pressures up to 15 GPA and
can exist
on
the deeper layers of the lithosphere,
than previously thought.
Results
research published
in the journal Nature
Communications and
is in the public domain.

Feldspars are called aluminosilicate minerals, which form up to 50 percent of the earth’s crust. Most
feldspar is a
solid
solutions
on
based Albita
Na[AlSi3O8],
of anortite
Ca[Al2Si2O8]
and orthoclase

K[AlSi3O8].
Crystal
the lattice of these minerals consists of
United
peaks
tetrahedra of SiO4
and
AlO4, in
the cavities between which are located
the cations of calcium,
sodium
and potassium.
Porcelain
(especially albite and anortite) are very commonly found in nature: in addition to
the earth’s crust they were discovered on the moon,
Mars, Venus, mercury and the composition of chondrites — the most common class of meteorites. So
of particular interest to scientists is
behavior
spars with
high blood pressure and
temperature —
it
to help you better
to understand
a
geological processes.
Earlier
it was shown that
in
the crust porcelain stable
at a pressure of not more than three GPA,
but
in experiments with
room
temperature
can
to withstand higher values.
The
not less
to investigate the compression spars at the pressure
more than 10 GPA, while no one
could.

German,

and American geochemists
under the leadership of Anna Pakhomova of
research
center
DESY
studied
modification of the lattice of albite
of anortite
and orthoclase
when
higher values of the pressure
— up to 27 GPA
(this
266
thousand
times
more than atmospheric
pressure
above sea level). The authors
work method used in
situ x-ray
spectroscopy
using a synchrotron source
that is, the recorded x-ray
range
directly
in the compression process of the mineral sample
in
a cell with diamond anvils.

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