Mixed Dark Lepidocrocite 8mm Large Hole Faceted Round - 8 Inch R0918 Onyx is a black and

Onyx is a black and white banded Chalcedony

4 Inches / 40x60mm / 4x6cm

and Magtalisai

Ancient Cellar Black Agate is a natural agate that is dyed and heated to give it the unique color and pattern we call Ancient Cellar

it's technically a type of quartzite

Mixed Dark Lepidocrocite 8mm Large Hole Faceted Round - 8 Inch R0918 Onyx is a black andAn iron oxide hydroxide mineral, Lepidocrocite forms when iron containing substances rust underwater. It is commonly found in the weathering of primary iron minerals and in iron ore deposits, and can be red to reddish brown. When skillfully cut and polished, those substances add a delicate accent to the otherwise clear gemstone.