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nosean

Nosean is a rare sodium aluminum silicate mineral in the feldspathoid group, notable for incorporating sulfate groups into its framework. Its chemical formula is Na8Al6Si6O24(SO4)3.

Nosean forms in silica-undersaturated, alkaline igneous rocks, particularly nepheline syenites and related phonolites. It occurs as

In terms of appearance, nosean is typically colorless to white, but impurities may give pink, yellow, or

The mineral name nosean is derived from the locality where it was first described, reflecting its rarity

late-stage
crystals
in
cavities
or
fractures
and
is
commonly
associated
with
cancrinite,
sodalite,
nepheline,
quartz,
and
alkali
feldspars.
brown
tints.
It
has
a
vitreous
to
resinous
luster
and
is
transparent
to
translucent.
It
has
a
Mohs
hardness
of
about
5
to
6
and
a
specific
gravity
of
approximately
2.3
to
2.5.
and
specialized
occurrence
within
the
feldspathoid
mineral
group.