HC Set: Large 2.9" 1.2lb Petrified Wood Sphere Natural Multicolor Fossil Quartz Crystal Ball Polished Mineral Ancient Fossilized Tree Stone - Madagascar + One Mahogany Obsidian Cabochon from Peru You will receive exactly this Petrified Wood Sphere - 74mm / 2 15/16 Inches Diameter; 550g / 19.4 oz / 1.2 lb (see photo, stand not included)! In additional, you will get one of the Mahogany Obsidian Cabochon similar to the one in the listing, the size and the color of the cabochon may slightly vary as well due to the fact that all minerals are different. Approximately Size: 10-30mm / 7/16-1 3/16 Inches; Approximately Weight: 15-40gr / 0.5-1.4oz. Petrified wood (from the Greek root petro meaning "rock" or "stone"; literally "wood turned into stone") is the name given to a special type of fossilized remains of terrestrial vegetation.Petrified wood is fossilized wood with the mineral composition of jasper, chalcedony and, less frequently, opal; it consists of silicon dioxide only. The organic wood is not changed into stone, but only the shape and structural elements of the wood are preserved. A variety or type of: Chalcedony, which is a variety of Quartz; Chemical Formula: SiO2; Color - multicolor. Elements such as manganese, iron and copper in the water/mud during the petrifaction process give petrified wood a variety of color ranges. Pure quartz crystals are colorless, but when contaminants are added to the process the crystals take on a yellow, red, or other tint. (The above information is provided solely for informational purpose. Kindly note that all stones are offered for decorative purposes only. Please, handle your stones with great care, do not grind or crumble them, do not dip or add them into your food or drink, do not use any parts of them in any elixirs, potions, lotions etc. Always make sure you wash your hands before and after working with your crystals.)