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Additional
melanterite
English Wikipedia - The Free Encyclopedia
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Melanterite
Melanterite
is a mineral form of hydrous
iron(II) sulfate
: FeSO
4
·7H
2
O. It is the iron analogue of the copper sulfate
chalcanthite
. It alters to
siderotil
by
loss of water
. It is a secondary
sulfate mineral
which forms from the
oxidation
of primary
sulfide minerals
such as
pyrite
and
marcasite
in the near-surface environment. It often occurs as a
post mine
encrustation on old
underground mine
surfaces. It also occurs in
coal
and
lignite
seams exposed to humid air and as a rare
sublimate
phase around
volcanic
fumaroles
. Associated minerals include pisanite,
chalcanthite
,
epsomite
,
pickeringite
,
halotrichite
and other sulfate minerals.
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