I only recently learned four new things about the Turquoise:

• It is what the Americans call Rhinestone.
• It is actually a very soft stone (and why it ususally gets tumbled to help harden it) (But turquoise as a colour is indeed a very light-filled colour and therefore has a "hard"/bright energy.) It's softness is also reflected in how permeable it is, influenced by external factors it will discolour easily.
• Tibetan turquoise is quite (pale) green in comparison (and often white and even softer on the inside)
• It is called Turquoise after Turkey (from where it travelled onwards to spread over Europe), which you already knew! Not after the colour which comes from the stone.
  I do believe that the Man behind the Hug-A-Rock post is quite as soft (if tumbled), bright, and harmonious as his crystal!