Garnierite is the name for a green nickel ore which is found in pockets and fissures of weathered ultramafic rocks (serpentinite, dunite, peridotite). It forms by lateritic weathering of ultramafic rocks; it consists of the magnesium-rich phyllosilicates serpentine, talc, chlorite and smectite in which a high percentage of magnesium is substituted by nickel. This is an old-time specimen from mining in North Carolina.