Petrified Wood Slab Opal A silicone-based mineral closely related

A silicone-based mineral closely related to quartz and agate

a crystal occurring in a wide variety of colors and forms

Chalcedony has a unique crystalline structure that gives it an enormously variable appearance

sometimes including growth rings

fossils of Knightia eocaena and their close relatives are popular among both amateur and seasoned collectors due to their delicate preservation of detail

Petrified Wood Slab Opal A silicone-based mineral closely relatedPerhaps the most well known fossil material in the world, petrified wood is not wood at all but rather the fossilized remnants of trees from millions of years ago. Tree trunks, limbs, and branches that died under conditions that favor fossilization gradually become replaced with minerals until what remains is a replica of the original piece of wood consisting entirely of mineral material. Like the trees they capture the form of, each is unique and