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The document discusses various types of semiprecious gemstones, particularly focusing on garnets such as almandite, pyrope, and andradite, detailing their compositions, colors, and gem-quality characteristics. It highlights the uses of garnet in ornaments and its significance in Ayurveda for health benefits. Additionally, it mentions chalcedony as a variety of agate with distinct color bands.

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17 views1 page

Promotes: Found

The document discusses various types of semiprecious gemstones, particularly focusing on garnets such as almandite, pyrope, and andradite, detailing their compositions, colors, and gem-quality characteristics. It highlights the uses of garnet in ornaments and its significance in Ayurveda for health benefits. Additionally, it mentions chalcedony as a variety of agate with distinct color bands.

Uploaded by

hello.manojkumar5591
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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sEMIPRECIOUS GEMSTONES 175 Ctr

mincrals, Almandite, pyrope, and green demantoid are well


of
silicate
for their gem quality.
known

A l m a n d i t e :
carbuncle, is the commonly available
also known as
1. garnet found in many metamorphic rocks. It is basically an iron-
aluminum compound. Whenever some of the iron is replaced by
mAgnestum,
ehe stone becomes red, like pyrope. A clear, transparent,
hstrous specimen of such a mixture becomes precious garnet, as it
0s cut as a
gem. Its pale violet variety is known as rhodolite.
Andtradite: is composed primarily of ccalcium and iron. Like almandite,
2. it is also very common. When found in yellow or green, it is called
topazolite; when red,
red, it is known as andradite; when black, melanite;
when green, it is demantoid, a gem-quality garnet.
AGrossularite: is 2 calcium-aluminum garnet normally colorless to
shite. but colored when it contains iron as an impurity. Iron makes
it assume various shades of yellow, cinnamon brown, rosy red, and
green. The name comes from itS resemblance in color to the Siberian
"gooseberry green" variety of grossularite garnet.
4. Pyrope: known as precious garnet, is mined in large quantities for
garnet paper. It is found at its best, clear and perfect, in South
African "blue earth" with diamonds. It is a magnesium-aluminum
garnetwith alittle trace of calcium and ion impurity. It is found in
adeep red color that appears black from a distance.
5. Spessartite: is quite a rare member of the group of aluminum garnets.
It containsmagnesium and aluminum, which gives it a violet tint that
makes it gem-quality and valuable. Gem-quality stones are found in
Vinginia granites.
0. Uvarovite: is a less common variety of garnet found in serpentine
The
rock and in limestone associated with the ore of chromium.
rich grecn color is due to the presence of chromium, which makes
it ahighly prized garnet.
Garnet is used in ornaments and other decorative items because
it is 2 scemiprecious stone, and therefore inexpensive. It is also
uscd as a pishthi in Ayurveda and acts like ruby. Garnet oxide and
pishthi of ruby. It stops bleeding
are made thecaused
and cures diseases by as
same way those
formation of stones in the body,
promotes vigor and vitality, and acts as
a sexual stlmulant.

semiprecious chalcedony. It
17.
found Gaurt is a variety
in many colors and
of agate,
contains bands of milky color; it is
used

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