Andean blue opal 5.65 ct.

Andean blue opal

is a type of opal that occur is a blue-green color, sometimes with black dendrites.Has no play of colors.

The cause of color: the copper content in blue opal is up to 1% Cu, it is coloured by irregular microscopic inclusions of chrysocolla (Fritsch et al., 1999) or other Cu silicate. Galillou et al. (2008) states that the inclusions can be Mg-rich shattuckite.

It may turns milky after some times,and can be restored by immersion in water for a while,but it will be for a limited time, therefore must handle with great care.The stone is not treated.Today is difficult to find material with good tranclucency , and good piece became quite rare.

It comes from a unique location in the world: Andean Mnts: Acari Mine,Caraveli Province,Arquipa Department,Peru.

Size: 15.8x8x6 mm.

Weight: 5.65 ct.

CODE#6365