Tourmaline
Tourmaline is a common mineral in igneous and metamorphic
rocks, as well as high-temperature hydrothermal veins, which may consist of
several colors. It is used in jewelry for colored varieties, but also to clean
the pipes due to its piezoelectric effect. It also has piezoelectric
properties, so that, when heated, both ends of opposite electrical charges
accumulate, which can attract dust through static electricity. Tourmaline is
also used in mineral exploration as a precursor sign geological formation gold
deposit.
Turquoise
Turquoise is an ornamental stone that gave its name to a
shade of blue. Its opaque appearance and especially its blue-green color is due
to the amount of copper it contains. For a long time, it is appreciated and
used by craftsmen and goldsmiths as gemstone.
Use: with horses in all circumstances (the stone then flies
to pieces).
Zircon
The zircons are yellow garnet called hyacinths.
Transparent specimens are used in jewelry for uses similar to those of diamond.
Sometimes colorless zircons have a natural color that ranges from golden to red
and brown, but they can also be green, blue or black. The dust is white zircon.
Zircon can be sparkling, that is to say, show an effect "cat's eye"
the stones cut into cabochons. The specimens, which by their size and purity
are considered as precious stones, are appreciated as a substitute for
diamonds, with which they are often confused. Some zircon grains have been
dated as the oldest known terrestrial minerals witnesses. The mineral zircon is
formed, among other things, in the genesis of plutonic rocks of the most
common, the main constituents of the Earth's crust: the granites at large. It
appears as one of the early products of primary crystallization of igneous
rocks such as granite and alkaline rocks.
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