Malachite
is a green opaque gem. It crystallize in the monocline system.
The
hardness is 3 and a half on the Mohs scale and, because sometimes it is found
in big blocks, is quite often carved to get cameos, art crafts and statuettes.
The
toughness is quite low, that’s why it must be handled with care. It can be
ruined by chemicals, especially acids. It is also quite sensitive to heat and
hot water.
In the past
the main source of Malachite used to be Russia, but now new deposits are in
Africa, Australia and USA. The best samples come from Shaba, Kenia.
Sometimes
is found along with the stone Azurite; the match create a stone called
Azurmalachite.
Historically,
it has always been a popular gemstone since the ancient Greeks and Romans, who
used it for carvings and ornaments that we can still see today. In Latin
culture it used to be associated with the Goddess Venus, they believed it can
help to reunify lovers and also console those who have lost their loved one.
Was also
used as an amulet to protect the owner from danger and especially to protect
children, since the time of Solinus it was suggested to put it directly in the
cradle of infants; also, to be placed near the woman womb to support conception
and childbirth. According to ancient beliefs it could be pulverized and dissolved in milk to
help with heart disease, or mixed with honey and applied to wounds to promote
healing.
When in the 18th century rich deposits were found
in Russia, the mineral became the favorite ornamental stone by the court of the
Tsar. An example of this are the great pillars of the church of St. Isaac in
Leningrad.
Malachite
is considered a semi-precious gemstone and maybe this is the reason why nobody
never created a synthetic version, but in the market there are many other
cheaper alternatives, such as plastic, glass or dyed agate.
The only
type of treatment that is applied to enhance the appearance is the impregnation
with mineral oils to make the surface shiny and smooth.