Lithium is found in rocks and minerals, drinking water, everyday foods, rechargeable batteries, pharmaceutical medications, and a wide range of industrial products. It’s the lightest metal on Earth, with an average concentration of about 35 parts per million in the upper continental crust, and it shows up in more places than most people realize.
Rocks and Minerals
Lithium doesn’t exist as a pure metal in nature. Instead, it’s locked inside minerals that form in igneous and sedimentary rocks. The four primary lithium-bearing minerals are spodumene, lepidolite, petalite, and zinnwaldite. Spodumene is the most commercially important of these and is the main target of hard-rock lithium mining operations in countries like Australia, which leads global production from mineral sources.
Lithium also concentrates in underground brine deposits beneath large salt flats. The most significant deposits sit in the “Lithium Triangle,” a region spanning Chile, Argentina, and Bolivia that holds more than 75 percent of the world’s known supply. Bolivia’s Salar de Uyuni, the world’s largest salt flat at 4,000 square miles, contains roughly half the planet’s total lithium deposits. Chile’s Salar de Atacama and Argentina’s Olaroz salt flat are also major extraction sites. To pull lithium from brine, operators pump mineral-rich water into shallow evaporation ponds and let the sun do most of the work over several months.
Drinking Water
Lithium occurs naturally in both groundwater and surface water at trace levels. A U.S. study sampling 369 drinking water sources found lithium ranging from 0.9 to 161 micrograms per liter in groundwater, with a median of about 14 micrograms per liter. Surface water sources had lower levels, ranging from less than 0.5 to 130 micrograms per liter with a median of roughly 4 micrograms per liter. The concentrations depend heavily on local geology.
One notable finding: conventional water treatment processes do almost nothing to remove lithium. Samples taken before and after treatment at drinking water plants were nearly identical, meaning whatever lithium is in your local source water is also in your tap water.
Foods and Dietary Sources
Lithium is present in small amounts across many common foods. Grains and vegetables tend to accumulate the highest concentrations, up to about 4.6 micrograms per gram. But the richest dietary sources may be nuts and legumes. Almonds and peanuts have been measured at roughly 10.5 and 9.0 mg/kg respectively in samples from the U.S., Spain, and Turkey. Soybeans range from 8 to 11 mg/kg.
Among vegetables, peas (about 4.2 mg/kg), tomatoes (2.9 mg/kg), beans (2.7 mg/kg), lentils (1.9 mg/kg), and potatoes (0.7 to 1.5 mg/kg) all contain measurable lithium. Leafy vegetables as a group carry the highest concentrations among vegetable types, followed by bulbous vegetables like onions and garlic. Grain-based foods vary widely: breakfast cereals have been measured anywhere from 0.9 to 4.4 mg/kg, while bread ranges from 0.01 to 5.4 mg/kg depending on the grain and where it was grown. Animal products like meat, eggs, and dairy contain lithium too, but at considerably lower levels.
Rechargeable Batteries
This is where most people encounter lithium in daily life, even if they don’t think about it. Lithium-ion batteries are the dominant rechargeable battery technology, powering smartphones, laptops, tablets, power tools, e-bikes, and electric vehicles like the Nissan Leaf and Tesla Model S. The hybrid-electric Boeing 787 also uses lithium-ion battery systems.
The most common chemistry in portable electronics pairs a lithium cobalt oxide cathode with a graphite anode. Other formulations exist for different applications. Electric vehicle batteries, for instance, often use different cathode materials optimized for higher energy density and longer lifespan. Lithium-polymer batteries, a variation using a gel-like electrolyte, are common in slimmer devices like tablets and wireless earbuds. In all these formats, lithium ions shuttle back and forth between the cathode and anode during charging and discharging, which is what makes the battery rechargeable.
Psychiatric Medications
Lithium salts, primarily lithium carbonate, have been used in psychiatry for about 70 years to treat bipolar disorder and, in some cases, major depressive disorder. The Australian psychiatrist John Cade first used lithium carbonate to treat mania in 1949, launching an entirely new approach to psychiatric treatment. Lithium citrate and lithium sulphate are also used, though less commonly.
Unlike most medications, lithium isn’t dosed by a fixed number of milligrams per day. Instead, doctors adjust the dose to achieve a target concentration in the blood, typically between 0.50 and 0.80 milliequivalents per liter for long-term treatment. Daily doses can exceed 1,200 mg of lithium carbonate for some patients. The lithium in these medications is the same element found in rocks and water, just concentrated and formulated into tablets or liquid.
Industrial Lubricants
Lithium grease is one of the most widely used lubricants in the world. It’s made by combining a base oil (mineral or synthetic) with a lithium soap thickener, which gives the grease a semi-solid consistency that stays in place rather than dripping or leaking away. This combination offers strong water resistance, thermal stability, and mechanical durability.
You’ll find lithium grease in automotive wheel bearings, chassis components, garage door tracks, and household hinges. Industrial applications include gears, motors, conveyor bearings, and manufacturing equipment. Lithium complex grease, which uses a more advanced thickener, handles higher temperatures and heavier loads, making it the go-to for steel mills, heavy machinery, and high-temperature production lines.
Glass, Ceramics, and Dental Materials
Lithium plays a key role in specialty glass and ceramics. When lithium oxide is combined with silica and heat-treated at temperatures between 550°C and 800°C, it forms crystalline structures that give the resulting material both strength and translucency. This is the basis for lithium disilicate glass-ceramics, which have become one of the most popular materials in modern dentistry for crowns and veneers because they look natural while being remarkably strong.
In broader manufacturing, adding lithium compounds to glass and ceramic formulations lowers melting temperatures and improves thermal resistance. This is why lithium shows up in heat-resistant cookware, ceramic glazes, and specialty glass products.
Aerospace Alloys
Adding lithium to aluminum creates alloys that are lighter and stiffer than standard aluminum, a combination the aerospace industry prizes. Every 1 percent of lithium added to aluminum reduces the alloy’s density by about 3 percent while increasing stiffness. These aluminum-lithium alloys are used in aircraft fuselage skins, structural frames, and spacecraft components. NASA’s Langley Research Center has studied aluminum-lithium alloys for fuselage applications, and testing showed that fuselage panels made with these alloys lasted longer under repeated pressurization cycles than panels built from conventional aluminum. The Russian Be-103 amphibious aircraft uses aluminum-lithium alloy in its fuselage, and the material has been evaluated for Tupolev business aircraft as well.