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Additional
feldspar
English Wikipedia - The Free Encyclopedia
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Feldspar
Feldspars
(
K
Al
Si
3
O
8
–
Na
Al
Si
3
O
8
–
Ca
Al
2
Si
2
O
8
) are a group of rock-forming
tectosilicate
minerals
that make up as much as 60% of the
Earth
's
crust
.
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