The shell is often found naturally polished with a green or brown spiral on one side and a white "eye" on the other
Azurite in crystal form is extremely rare and expensive
and it is known to have been widely used in Aztec and Native American cultures
Iolite most commonly occurs in shades of blue-gray
it is believed to have been worn Cicero
Eudialyte 8mm Round - 15-16 Inch 13x40mm The shell is often foundEudialyte is a complex silicate mineral that most commonly forms in granular patterns. It is usually found within coarse grained rocks and contains calcium, cerium, sodium, iron, manganese, zirconium, and yttrium. This stone ranges in color from pink and red to brown, violet, and even green; sometimes with inclusions of Black Tourmaline. It was first discovered in Greenland by F. Stromeyer in 1819 and was named after the Greek words eu dialytos