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Additional
quartz
English Wikipedia - The Free Encyclopedia
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Quartz
Quartz
is the second-most-abundant
mineral
in
Earth
's
continental crust
, after
feldspar
. Its
crystal structure
is a continuous framework of SiO
4
silicon
–
oxygen
tetrahedra
, with each oxygen being shared between two tetrahedra, giving an overall
chemical formula
of
SiO
2
.
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