Shattuckite 8mm Star Cut Coin - 15-16 Inch Cat's Eye often with a mottled appearance

often with a mottled appearance

and is a result of trace amounts of copper or chromium

Brazilian Amazonite is an opaque blue-green to light green stone

which takes millions of years

Shattuckite 8mm Star Cut Coin - 15-16 Inch Cat's Eye often with a mottled appearanceShattuckite is a rare copper silicate hydroxide mineral. It occurs in bright turquoise blues and darker blues as well as rust reds, commonly with inclusions of copper in speckled patterns throughout the stone. Shattuckite is a pseudomorph, meaning it forms by replacing another minerals crystal structure atom by atom with its own crystal structure, with little alteration of the external shape of the original crystal.