Stone Semi-grained Turquoise with Pirite

The Turkish belongs to the mineral class of phosphates and its color goes from the blue sky to the green and typically with "grainy" gloss.

Often, associated with turquoise, is the so-called matrix composed of iron hydroxides and mother rock, of brown or black color; when this matrix is in the form of a network of finely distributed veins that through the mineral is called turquoise "web spider" (draw it).