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Vermiculite
Vermiculite
is a
hydrous
phyllosilicate
mineral
. It undergoes significant expansion when heated.
Exfoliation
occurs when the mineral is heated sufficiently, and the effect is routinely produced in commercial furnaces. Vermiculite is formed by
weathering
or
hydrothermal alteration
of
biotite
or
phlogopite
. Large commercial vermiculite mines currently exist in
Russia
,
South Africa
,
China
, and
Brazil
.
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