Lithium Lithium Lithium (from ) is a chemical element with symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the lightest metal and the lightest solid element. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. When cut, it exhibits a metallic luster, but moist air corrodes it quickly to a dull silvery gray, then black tarnish. It never occurs freely in nature, but only in (usually ionic) compounds, such as pegmatitic minerals which were once the main source of lithium. Due to its solubility
Type 72 non-metallic anti-tank mine of the its low metal content, the Type 72 cannot be located using metal detectors under most field conditions. The Type 72 is resistant to shock and overpressure from explosive breaching systems such as the Giant Viper and MICLIC. A copy of the mine, the YM-III (sometimes YM-3), is produced in Iran. It is slightly heavier at 7 kg, with a slightly heavier 5.7 kg Composition B main charge, with a slightly higher activation pressure of 450 to 900 kg. Additionally, a copy is produced in South Africa as "Non-metallic anti-tank mine". Type 72 non-metallic anti-tank mine Type 72 Non-Metallic