Onyx
Onyx is a variety of chalcedony. The sardonic is a variant
of onyx in which the colored bands are sard color (the sardine is a reddish
brown variety of chalcedony) rather than black.
Use: causes discord among enemies.
Opal
The opal, transparent to translucent, is a form of hydrated
silica. The amount of water in the opal varied density. Some varieties of opal
are not compact and the introduction of pigments that change their base color.
The pure mineral is transparent or milky, the base color varies from yellow to
brown, through orange and even red, but the colored lights of opal are due to
the play of light caused by the stratification that cause interference and give
the pearly luster. Glare white, blue, gray and black (so rare stones are more
expensive) are quite common and red highlights are very rare. The opal has
different varieties, some of which are used in jewelry and classified as gemstones;
these varieties are distinguished by their origin, background color or nature.
Opal is a hydrated mineral; it is advisable to keep her jewelry in cotton damp.
This will avoid losing water, and therefore its brilliance.
Use: good luck, healing in close contact with the eye.
Peridot
Peri dot, yellowish-green or olive green, is the name given
to the olivine when used as a gemstone in jewelry.
Use: immunity against enchantments.
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