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Silicon dioxide, also
known as silica, is an
oxide of
silicon with the
chemical formula SiO2,
commonly found in
nature as quartz. In many
parts of the...
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source of
dissolved silica in the
porous media could be the ****ules of
silicious sponges (demosponges).
Certain types of flint, such as that from the south...
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classification is done by
composition as high calcium,
argillaceous (clayey),
silicious, conglomerate, magnesian, dolomite, and
other limestones.
Uncommon sources...
- ****ules are
structural elements found in most sponges. The
meshing of many ****ules
serves as the sponge's
skeleton and thus it
provides structural support...
- cross-bedded and
probably wind-deposited,
lying in the canyon.
Miocene silicious clay
covering a very
limited area.
Eocene limestone covering most of the...
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mineral was
described in the
patent application as
pulverised gl****,
silicious stones, or asbestos, in
powdered form. Much
development ensued by the...
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dating back to the
Cambrian period. It is
described in
Vermont as "Gray
silicious to black, graphitic,
pyritiferous slate and phyllite,
locally with interbedded...
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culture found at
Mtaileb I -
Double ended pick,
triangular section with narrowing,
jagged edges at both ends.
Light grey and
streaky silicious limestone....
- of the mountain. It is soft yet brackish, and
there is no
deposit of
silicious or
cretaceous matter, but it has a
strong smell of sulphur." He further...
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culture found at
Mtaileb I -
Thick and
heavy biface,
retouched all over with
jagged and
irregular edges.
Light grey and
streaky silicious limestone....
