Peruvian Turquoise (Chrysocolla) 8mm Round - 15-16 Inch JUL4-DSP and this phenomenon is thought

and this phenomenon is thought to be due to impurities of yttrium or organic matter within the crystal lattice

or bright blue

Moss Agate is a variety of Chalcedony

Iolite most commonly occurs in shades of blue-gray

Peruvian Turquoise (Chrysocolla) 8mm Round - 15-16 Inch JUL4-DSP and this phenomenon is thoughtPeruvian Turquoise is also known as Turquoise Chrysocolla. Its attractive blue green provides a unique color to the mineral world. Peruvian Turquoise is an important ornamental mineral for jewelry and adorned the ceremonial dress of early native Inkas. It also brings good fortune and attracts healing spirits. Delicate veining, caused by impurities, is desired by some collectors as proof of a natural stone.