Some amethyst is
alumina.
others is violone, a silicate of aluminum and lithium,
it contains iron. The deeper the
color, the more
valuable - due
to presence of manganese oxide. Oriental Amethyst
or Violet Sapphire is a form of
corundum and similar to sapphire and
ruby diamond. A beautiful
amethyst sample is a violet
gem weighing 48 carats
in the
Allison Gem Collection, Australia.
The best amethyst come from Siberia,
Ceylon, Brazil and Persia or Iran.
but a large one found in a
cave of amethyst in Brazil
is a huge crystal which
measures 33' by 6' x 3'-
the largest
ever found.
Amethysts usually are found
in pretty compositions of
several crystals of
different colors.
But be
careful when you buy a
amethyst since in many
countries, in particular in
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