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Adularescence effect in Gemstones @ Jewel Info 4 U
By: NASRINA PARVIN KHAN
Special optical phenomenon is
the property of gems which give the
distinct identity of gems and add
value. Adularescence is such a
phenomenon that has been specially
seen in moonstone.
A milky sheen or wavy glowing light
effect which appears to come from
below the surface of the gems is
known as adularescence. Orthoclase
feldspar named moonstones is the
only example which exhibits the true
adularescence.
Sometimes, a golden shifting light
displayed by certain quartzes and
opals in the interior of them is
known as "adularescence". But
usually it is called as "girasol"
effect.
Adularescence in moonstones
Adularescence of moonstone and
Labradorscene of Labradorite are
related phenomena and looking
similar. Both the gems belong to
feldspar family and this is the
reason of their similarity.
The milky, bluish/white sheen named
as adularescence in moonstone
appears to float along the
transparent body. Thus the
phenomenon adularescence seems to be
move around the body of the stone
when it is turned.
The name adularescence derives from
"adularia". Because the moonstone
which posses the phenomenon mainly
historically known as "adularia".
image:
Mineralminers.com
The most popular color of moonstone
is blue, but it also found in gray,
white, pink, green and brown etc.
normally the nature of moonstone is
transparent to translucent.
Traditionally moonstone came from
the country Sri Lanka. The Sri
Lankan moonstone are classical
bluish and nearly transparent in
nature. They are also found in USA,
Australia, Brazil, Myanmar,
Madagascar and India. Indian
specimen shoe cloudy plays of light
with beige brown, brown, orange,
green background.
The distinct pearly moon like
glowing shimmer of moonstone caused
by the reflection of light.
How Adularescence happens?
The structural pattern of the gem is
the reason of this distinct optical
phenomenon. Moonstone is made up of
potassium Aluminium silicate.
Adularescence is caused by the layer
effect due to presence of tiny
inclusions of another feldspar in
the host material. Inclusions of
sodium feldspar by exclusion in the
potassium feldspar create a layer,
where thin inner strata of two types
of feldspar intermix. Interference
effect of light occurs in gems due
to these layers. Reflected light
scatters equally in all spectral
regions and produce a shiller. The
colors of the shiller may be white,
blue or blue-and orange by this
phenomenon. But the valuable as well
as desirable color of this shiller
is blue, which is usually produced
by a white or gray body colored
stone. Thin layers help to produce
attractive shiller, whereas less
attractive whitish shiller produced
by thick layers. The size or
distance from layer to layer
determines the colors we see in many
cases.
Unique play of light, which called
as adularescence, makes moonstone
very special. Cutting is very
important for moonstone to show the
phenomenon adularescence. The stone
must be cut as tall, domed shape,
which called as cabochon to exhibit
the phenomenon. The exact height of
the stone is very essential.
Thereafter the axis of the crystal
must be located exactly in the
zenith of the stone.
Polishing is also important to get
the desired effect. A dulled
moonstone can be obtained the
magical effect of adularescence by
the polished in such a way.
Usually, the moonstone are available
in transparent to translucent way.
But a larger and more transparent
stone is more valuable than others.
Intensity of the color is also add
value to the stone.
The soft, sensuous, mysterious
glowing light effect named as
adularescence in moonstone gives the
stone a feminine character and makes
it attractive. Moreover the movement
of the stone helps to exhibit the
phenomenon adularescence. So, to
create the seductive charm of
adularescence in moonstone, it
requires be wearing and moving a
lot.
Actually the astonishing effect of
adularescence makes the moonstone
seductive, sensuous and highly
desired and more valuable.
More Resources
About Adularescence in yourgemmologist
http://www.swdgems.com/phenomena.html
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