Yggdrasil, the tree of life (Norse mythology). Its many roots and limbs keep all the different worlds together: Asgard, Midgard, Helheim, Niflheim, Muspellheim, Svartalfheim, Alfheim, Vanaheim and Jotunheim. Below its roots there is the spring that fills Mimisbrunnr, the well of wisdom, guarded by Mimir.
The word Turquoise is very old. It derives from french "Pierre Turquoise", meaning Turkish Stone. It is believed that this comes from a confusion, because there aren't Turquoises in Turkey, but the first dealers who brought the gemstone to Europe were Turkish. The Turquoises were found in Iran, but they were associated with Turkey. Even the best quality Turquoises are fragile stones, with a maximum hardness level just below 6 in the Mohs scale, slightly less than a normal window glass. Turquoise boosts communication, eloquence and creativity. It is known as the joy and welfare stone. It absorbs negative energy. It helps see life favourably and with good mood. Amulet for travelers. Useful against the evil eye. It helps to increase attention and clarifies ideas.