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Additional
gypsum
English Wikipedia - The Free Encyclopedia
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Gypsum
Gypsum
is a soft
sulfate mineral
composed of
calcium sulfate
dihydrate
, with the
chemical formula
CaSO
4
·2H
2
O. It is widely mined and is used as a
fertilizer
, and as the main constituent in many forms of
plaster
,
blackboard
chalk and
wallboard
. A massive fine-grained white or lightly tinted variety of gypsum, called
alabaster
, has been used for
sculpture
by many cultures including
Ancient Egypt
,
Mesopotamia
,
Ancient Rome
,
Byzantine empire
and the
Nottingham alabasters
of medieval England. It is the definition of a hardness of 2 on the
Mohs scale of mineral hardness
. It forms as an
evaporite
mineral and as a hydration product of
anhydrite
.
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