Turquoise Feroza Birthstone Old Designs New Fashion Jewellery.

Turquoise Feroza Birthstone Old Designs New Fashion Jewellery.

 Turquoise Feroza Birthstone Old Designs New Fashion Jewellery.

 By Aamir Mannan 

Even the finest of turquoise is fracturable, reaching a maximum hardness of just under 6, or slightly more than window glass. Characteristically a cryptocrystalline mineral, turquoise almost never forms single crystals and all of its properties are highly variable. Its crystal system is proven to be triclinic via X-ray diffraction testing. With lower hardness comes lower specific gravity (2.60–2.90) and greater porosity: These properties are dependent on grain size. The lustre of turquoise is typically waxy to subvitreous, and transparency is