The name given to the turquoise is its former trade route, which crossed Turkey ("Turkish stone"). Its 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 colour 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: manyelig, uneven.