The beads are small beads, usually white, created by certain
mollusks, primarily oysters. When an object passes irritant inside the shell,
the animal reacts by surrounding the object with a layer of calcium carbonate.
This mixture is called nacre. The pearl has now rependu and pearls are rarely
found in the wild. The aesthetic quality of the pearl depends on the thickness
of the shell but also the regularity of crystallization. The beads are used to
make jewelry. They owe their iridescent sheen (close to the rainbow in the sky)
to the reflection and refraction of translucent layers of nacre. The brightness
is particularly fine as the layers are thinner and numerous. Pearls are often
white, sometimes tinged with cream or pink, but may be tinted yellow, green,
blue, brown or black. Black pearls are very expensive because it is very rare.
Moonstone
The Moonstone is an opalescent variety of orthoclase, quite
sensitive to shocks, which evokes the moonlight. If the layers are thin enough,
they give a nice blue. A reflection in one band can provide a moonstone-eye
cat. The large stones of good quality are rare and expensive. The yellow
orthoclase is a particular variety of orthoclase champagne color. Is fragile,
it is size emerald cut for collectors.
Use: causes lycanthropy.
Quartz
It comes either in the form of large colorless crystals,
colored or smoked, either in the form of microscopic crystals of translucent
appearance. Quartz is known since time immemorial: the patricians are using
rock crystal balls to cool their hands in summer: the quartz is indeed an
excellent thermal conductor. It is also used for water treatment but also Litho
therapy (stress, fatigue, anxiety). In nature, quartz is rarely in the form of
single crystals of sufficient quality. The crystals can also contain
inclusions, liquid, gaseous or solid. Since it is very common and hard, quartz
can be used, like the flint to start a fire the spark produced by the
percussion of a steel blade, used to ignite combustible materials such tinder.
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