MATERIAL: Nephrite, Sodalite, Aragonite. CONDITION: Very good condition. Size: 3,9 inch (99 mm) x 2,9 inch (73 mm) x 2,6 inch (66 mm). Weight: 6,5 oz (185 g). 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. 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. Please buy AS IS. Item not tested.