What Is Magnesium? Critical Mineral Uses & Supply Risk

• What is magnesium: a lightweight structural metal and USGS critical mineral
• China controls roughly 86% of global primary magnesium production capacity
• The United States has had no primary magnesium smelter since 2001
• Magnesium alloys cut vehicle weight and extend EV battery range
• Verde Magnesium is building Europe’s first primary smelter in 25 years
• Magnesium hydride is under research for solid-state hydrogen storage

What is magnesium, and why has an element best known as a dietary supplement become one of the most closely watched entries on the critical minerals list? Magnesium (Mg) is the lightest structural metal in commercial use — roughly a third lighter than aluminium and 75% lighter than steel — and it sits on the USGS 2025 List of Critical Minerals at the highest risk tier alongside gallium, germanium, and several rare earths. That status is driven less by scarcity and more by geography: production is concentrated almost entirely in one country, and Western supply chains have no meaningful backup.

What Is Magnesium? Properties and Characteristics

Magnesium is the eighth most abundant element in the Earth’s crust and a shiny, reactive grey metal that oxidises quickly in air. Its defining commercial property is density: at roughly 1.7 g/cm³, it is the lightest of all structural metals used at industrial scale. Most primary magnesium is produced via the Pidgeon process, a thermal reduction method using dolomite ore and an energy-intensive silicothermic reaction — a process that is itself a supply chain vulnerability, since it ties magnesium output directly to the availability of cheap energy.

What Is Magnesium Used For?

Magnesium’s single largest industrial use is as an alloying agent for aluminium, where even small additions significantly increase strength — this is what makes automotive-grade aluminium sheet and beverage cans possible. Beyond alloying, magnesium die-cast components (steering columns, seat frames, gearbox housings) are used directly by automakers to cut vehicle weight, which translates into extended range for electric vehicles and lower fuel burn for internal combustion models. Aerospace and defence manufacturers use magnesium alloys for the same strength-to-weight reasons, in components ranging from aircraft housings to precision-guided munitions. A smaller but fast-growing category is next-generation energy storage: magnesium-ion batteries are being researched as a potentially safer alternative to lithium-ion chemistry, since magnesium’s +2 charge state offers higher theoretical volumetric energy density, and magnesium hydride (MgH₂) is being developed as a solid-state medium for storing and transporting hydrogen.

Where Is Magnesium Produced?

China dominates magnesium production to a degree that few other critical minerals match. According to USGS Minerals Yearbook data, China accounted for roughly 86% of global primary magnesium capacity and around 89% of production outside the United States, and the concentration has only deepened since domestic energy-shortage-driven production halts in China caused magnesium prices in Europe and North America to spike sharply. The United States, by contrast, has had no active primary domestic magnesium smelter since its last producer closed in 2001; the country’s share of world primary magnesium capacity has fallen from around 30% in 1998 to roughly 3% today, and US supply now depends almost entirely on imports and secondary recycling. Europe is in a similar position — more than 90% of the EU’s magnesium is imported from China. That is starting to change: Verde Magnesium, designated a Strategic Project under the EU’s Critical Raw Materials Act, is developing what would be Europe’s first primary magnesium operation in 25 years at a site in Bihor County, Romania, targeting a quarry restart by the end of 2026, an initial “Mother Plant” of around 360 tonnes per year, and a scale-up to as much as 30,000 tonnes per year by 2030 — enough, if realised, to meet roughly half of current EU demand. See the International Magnesium Association for industry statistics and producer detail.

Magnesium Price and Market

Magnesium is priced primarily off Chinese domestic and export benchmarks, since China sets the marginal cost for most of the world’s supply. As of mid-July 2026, Shanghai Metals Market reported 99.90% magnesium ingot trading in the Fugu production region at roughly 15,750–15,850 yuan/tonne domestically, with China FOB export offers around $2,220–2,350 per tonne — though the market has been described as weak, with producers making concessions to move inventory amid soft demand both domestically and for export. For the current benchmark price, full price history, and per-unit and per-currency conversions, see CMN’s magnesium price tracker, updated monthly.

Magnesium Supply Chain Risks

The core risk is concentration, not geology — magnesium is abundant, but the capacity to smelt it economically is not. China’s near-monopoly on the energy-intensive Pidgeon process means any domestic Chinese energy policy shift, environmental crackdown, or export control can ripple directly into Western automotive, aerospace, and defence supply chains with little warning, as happened during the 2021–22 energy-shortage price spike. Because magnesium recycling requires only a fraction of the energy of primary extraction, secondary recycling capacity is increasingly viewed as a practical near-term hedge for Western manufacturers, alongside onshoring projects like Verde Magnesium. Buyers should also watch capacity build-out timelines closely: even a successful Verde ramp-up would only meet a portion of EU demand by 2030, leaving a substantial structural gap for the rest of this decade. For broader context on how magnesium fits into the wider critical minerals landscape, see CMN’s critical minerals overview and the latest critical minerals market update.

This article is for informational purposes only and does not constitute investment advice.