The name given to the turquoise is ist former trade route, which crossed Turkey ("Turkish stone"). Ist color is rarely only blue, usually it is traversed by anthracite, brown or black veins of other rocks or minerals. However, with a heat of 250 ° C, the color changes into an ugly green.

TURQUOISE (Kallait)
Colour: sky blue, blue green, apple green
Mohs hardness: 5.0-6.0
Density: 2.31-2.84
Transparency: opaque, opaque
Break: muchelig, uneven.