Green Nephrite "Inca Jade" Cabochon Rare Stone Rock Cab Polished Gemstone Mineral Stone Pebble from Peru - 10 PCS You will get 10 pcs of the Nephrite Cabochons 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. (Red Jasper Bowl NOT included!) Approximately Size: 10-30mm / 7/16-1 3/16 Inches; Approximately Weight: 15-40gr / 0.5-1.4oz; Jadeite and nephrite are the materials that have been collectively known as "jade" for thousands of years. Nephrite is a variety of the calcium and magnesium-rich amphibole mineral actinolite. Nephrite is a fibrous aggregate variety of tremolite-actinolite, a basic calcium magnesium iron silicate, whereas jadeite is a pyroxene mineral. Nephrite is more common than jadeite and although it is slightly softer than jadeite, it is considered tougher due to its denser structure. Nephrite is one of the two rocks termed as jade, the other being jadeitite = jadeite jade, consisting mostly of jadeite. Both are extremely tough and resistant to fracture such that they have been used for making choppers and blades since Neolithic times. In addition to amphibole, nephrite can contain minor to trace amounts of diopside, grossularitic garnet, magnetite, chromite, graphite, apatite, rutile, pyrite, datolite, vesuvianite, prehnite, talc, the serpentine polymorphs and titanite. Chemical Formula: Ca2(Mg,Fe2+)5[OHlSi4O11]2, Basic calcium magnesium aluminum silicate; Hardness: 6 to 6.5 on the Mohs scale; Color: Light to dark-green, black, yellow to brown, pink, white and other colors. (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.)