Cacoxenite 8x10mm Tri Cut Faceted Rondelle - 15-16 Inch R0382 and this phenomenon is thought

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

gold and brown

Petrified Wood Agate is formed from the petrifaction process of primeval trees over the course of many years

An orthoproxene mineral

Yellow Opal does not display the changeable flash of internal luster that other opals are known for

Cacoxenite 8x10mm Tri Cut Faceted Rondelle - 15-16 Inch R0382 and this phenomenon is thoughtCacoxenite is the trade name for this naturally occurring blend of seven stone types. It was originally named for the visible inclusions of the mineral Cacoxenite. However, this stone, often called the "Super Seven" or "Melody Stone" contains Amethyst, Clear Quartz, Smoky Quartz, Lepidocrosite, Goethite, and Rutile as well.