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Additional
Case hardening of rocks
English Wikipedia - The Free Encyclopedia
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Case hardening of rocks
Case hardening
is a
weathering
phenomenon of rock surface
induration
. It is observed commonly in: felsic alkaline rocks, such as
nepheline syenite
,
phonolite
and
trachyte
;
pyroclastic rocks
, as
pyroclastic flow
deposit, fine air-fall deposits and vent-filling pyroclastic deposits;
sedimentary rocks
, as
sandstone
and
mudstone
.
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