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Gypsum (CaSO
4
.2H
2
O) is a hydrated calcium
sulphate used widely in industry because
of its special property of losing three-fourth of
the combined water of crystallisation when
moderately heated (calcined) to about 130
o
C.
Besides, calcined gypsum when cooled, finely
ground and made plastic with water can be spread
out, cast or moulded to any desired surface or
form. On drying, it sets into a hard rock-like
form. Selenite is a colourless, transparent,
crystalline variety of gypsum, whereas alabaster
is a fine grained, massive variety
, white or shaded
in colour
. Silky and fibrous variety of gypsum is
called satin spar
.
Anhydrite (CaSO
4
) is a calcium
sulphate mineral found associated with gypsum
commonly as a massive or fibrous mineral.
Gypsum that occurs in nature is called mineral
gypsum. In addition to mineral gypsum, seawater
and some chemical plants are sources of by-
product marine gypsum and by-product chemical
gypsum, respectively
.
The later is obtained as by-
product phospho-gypsum or fluoro-gypsum,
depending upon the source. Phosphoric acid
plants are important sources of by-product
phospho-gypsum.
Marine gypsum is recovered from salt pans
during production of common salt in coastal
region, particularly in Gujarat and
T
amil Nadu.
The
recovery of by-product gypsum and marine
gypsum together is substantial and is comparable
with the production of mineral gypsum.
Synthetic gypsum is recovered via flue gas
desulphurisation at some coal fired electric power
plants in western countries.
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