Blue Black Porcelain Agate 10mm Round - 15-16 inchPorcelain Agate is a natural agate that is dyed and heated to give it the unique blue black color and pattern that resembles porcelain.

and features dark manganese dendrites throughout

mustard yellow

resulting in fossils that are chalk-white

The Peruvian material has a lighter tone of Pink than deposits found in other parts of North and South America

Tektite is a natural glass formed by meteorite collisions with Earth

Apatite can exhibit chatoyancy — an uncommon optical phenomenon in some stones that resembles the light reflection of a cat’s eye

Tibet and other Asian countries

mined since 4000 BCE

Chrysocolla was first described by Theosphrastus

which takes millions of years

and much of the black Onyx on the market has been artificially colored

with occasional inclusions of Black Tourmaline that crisscross the stone in fibrous patterns