What Is Gallium? Element 31, Critical Mineral, and Compound Semiconductor Feedstock

Gallium at a Glance

What Is Gallium as a Chemical Element?

Gallium is a post-transition metal, atomic number 31, in Group 13 (IIIA) between zinc (Zn, 30) and germanium (Ge, 32). Its electron configuration is [Ar] 3d¹⁰ 4s² 4p¹. The single 4p valence electron determines gallium's dominant +3 oxidation state and its semiconductor behavior in compound form. Gallium has two stable isotopes: Ga-69 (60.1% natural abundance) and Ga-71 (39.9%).

Gallium sits in the same group as aluminum (Al, 13), indium (In, 49), and thallium (Tl, 81). Like aluminum, its +3 ion forms oxide and hydroxide compounds. Unlike aluminum, gallium is amphoteric in a broader sense - Ga₂O₃ dissolves in both concentrated acids and strong bases. Unlike indium, gallium bonds with arsenic, nitrogen, and phosphorus to form direct-bandgap semiconductors with electron mobilities and optical properties that silicon cannot match.

In solid form, gallium adopts an unusual orthorhombic crystal structure (alpha phase, Cmce space group). Each gallium atom bonds covalently to one nearest neighbor, forming Ga₂ dimers at 2.44 Å, while also coordinating weakly with six next-nearest neighbors at 2.70-2.79 Å. This mixed covalent-metallic bonding is why solid gallium fractures with a conchoidal (glass-like) pattern rather than the ductile deformation typical of most metals. See gallium physical and chemical properties for the full data set on thermal, electrical, and mechanical properties.

How Was Gallium Discovered?

French chemist Paul-Émile Lecoq de Boisbaudran discovered gallium on August 27, 1875, by observing two previously unrecorded ultraviolet spectral lines when analyzing zinc blende (sphalerite) ore from the Pierrefitte mine in the Pyrenees. From 52 kilograms of ore, he isolated several milligrams of gallium chloride, then produced metallic gallium by electrolysis later that year.

Lecoq de Boisbaudran named the element after Gallia, the Latin name for France - confirming his nationality as the motivation, not a pun on his surname (gallus = Latin for rooster, the French le coq). He denied the wordplay hypothesis directly in an 1877 publication. The discovery was announced to the French Academy of Sciences on August 27, 1875 - the date now recognized as the official discovery.

The spectroscopic identification method Lecoq de Boisbaudran used was new at the time. He had developed his own spectroscopic techniques and was systematically analyzing mineral samples for unaccounted spectral lines, a deliberate search for undiscovered elements rather than an accidental observation. The two violet lines he identified were at wavelengths that did not match any then-known element. The total quantity of metal he isolated in 1875 was slightly more than 1 gram, obtained from hundreds of kilograms of processed mineral material.

Why Did Mendeleev Predict Gallium Before It Was Discovered?

In 1871, Dmitri Mendeleev predicted the existence, atomic weight, density, oxide formula, and chemical behavior of an undiscovered element he called "eka-aluminum" (one step below aluminum in his periodic table). His predicted density of 6.0 g/cm³ matched the measured density of gallium (5.91 g/cm³). The predicted atomic weight of 68 matched the actual value of 69.72. He correctly predicted the oxide formula as E₂O₃ (actual: Ga₂O₃).

When Lecoq de Boisbaudran announced gallium's discovery, Mendeleev wrote to him suggesting the density measurement should be repeated - his periodic table predicted 5.9-6.0 g/cm³, and Lecoq de Boisbaudran's initial measurement was slightly different. After refining his sample and repeating the measurement, Lecoq de Boisbaudran obtained 5.91 g/cm³, matching Mendeleev's prediction. The exchange was not a correction of error but a demonstration of the predictive power of the periodic law - the table's structure implied properties that physical measurement later confirmed. Gallium's discovery and characterization in 1875 was the first major validation of Mendeleev's periodic table as a predictive scientific tool.

Where Does Gallium Come From and How Is It Produced?

Gallium is produced as a byproduct of the Bayer process, the industrial method for refining bauxite ore into alumina (Al₂O₃), which is then smelted into aluminum metal. Bauxite contains gallium at 50-80 parts per million on average. During the Bayer process, bauxite is digested in hot caustic soda solution, which dissolves both alumina and gallium into the processing liquor. Gallium accumulates in recycled Bayer liquor to concentrations of 100-300 ppm, from which it is extracted by ion exchange or solvent extraction, then reduced to metal by electrolysis.

Gallium is not present in any known mineral deposit at concentrations that would justify direct mining. No gallite (CuGaS₂), gallite-bearing skarn, or other gallium mineral has been found in a grade or tonnage that competes with byproduct recovery. The entire global primary production - approximately 750 metric tonnes in 2024 - is a byproduct of refining other metals, which means gallium output tracks primary aluminum and zinc production rather than gallium demand or price.

This creates a structural supply rigidity: a doubling in gallium prices does not directly incentivize building new gallium production capacity, because gallium producers are aluminum or zinc companies whose investment decisions are driven by aluminum and zinc markets. Gallium recovery is added to existing refinery operations where it is economically viable; it is not a stand-alone business. See gallium supply chain and refining for process details and capacity data.

The 15-step gallium purification pathway - from crude metal at 2N-3N purity out of Bayer processing to 6N or 7N wafer-grade material - adds cost and technical complexity at each stage. See gallium purity grades for the full grade specification and pricing structure.

How Much Gallium Does China Produce and Why Does It Dominate Supply?

China accounts for approximately 99% of global primary gallium production. In 2024, total global output was roughly 750 metric tonnes, with all but a small fraction coming from Chinese alumina refineries. China's dominance reflects its position as the world's largest aluminum producer: China processed approximately 76 million metric tonnes of alumina in 2023, compared to about 37 million metric tonnes for the rest of the world combined. More alumina processing means more Bayer liquor, which means more gallium available for extraction.

China's gallium producers are predominantly subsidiaries or affiliates of large aluminum groups: Chinalco (Aluminum Corporation of China) operates three gallium recovery facilities in Henan, Guangxi, and Guizhou provinces with combined capacity of approximately 200 metric tonnes per year. Zhuhai Fangyuan, East Hope, and Zhuzhou Keneng are additional major producers. These facilities extract gallium from Bayer liquor as a value-added step alongside their core alumina operations.

The non-Chinese production base is small and fragmented. 5N Plus in Quebec (Canada) processes and refines gallium to high purity. Indium Corporation, partnering with Rio Tinto at the Vaudreuil alumina refinery in Quebec, demonstrated a 3.5 tonne/year gallium extraction pilot and is planning scale-up to approximately 40 tonnes/year - about 5% of current global demand. Japan and South Korea maintain domestic refining capacity but rely on Chinese crude gallium as feedstock.

China began restricting gallium exports in stages from 2023 onward:

The November 2025 suspension followed a meeting between Chinese and US leadership and a broader one-year trade truce. Gallium exports to the US resumed on a licensed basis, but the structural supply concentration remained unchanged. See US critical minerals policy and gallium for policy response details.

Why Is Gallium Classified as a Critical Mineral by the US and EU?

The USGS includes gallium on its Critical Minerals List (published 2018, updated 2022, confirmed 2025) on the basis of supply concentration risk and economic importance to US manufacturing. The US is 100% import-dependent for gallium, with China as the source of virtually all supply. USGS ranks gallium 6th among minerals by estimated probability-weighted economic impact of supply disruption.

The EU designated gallium as both a Critical Raw Material and a Strategic Raw Material under the Critical Raw Materials Act (CRMA) passed in 2023 - one of only 16 materials to receive the strategic designation, indicating both supply risk and particular importance to the EU's clean energy and defense industrial base. The CRMA sets EU targets for gallium: 10% domestic extraction, 40% domestic processing, and 25% recycling capacity by 2030.

The critical mineral designations unlock government procurement preferences, supply chain investment programs, and trade policy tools for domestic alternatives - but have not yet created the domestic production capacity needed to reduce import dependence. Western production projects under development (Rio Tinto / Indium Corporation in Quebec; Recapture Metals in the US) would, at full buildout, cover a small fraction of US demand. The fastest path to supply diversification in practice is not new mining but recovery from existing alumina refineries in Australia, India, and the Middle East - regions with large bauxite processing capacity where gallium extraction infrastructure has not been installed.

What Is Gallium Used For?

Approximately 95% of gallium demand is for compound semiconductors. GaAs (gallium arsenide) and GaN (gallium nitride) are the two industrial workhorses. GaAs is used in RF amplifiers and filters in smartphones (8-10 GaAs chips per 5G handset), satellite solar cells (>90% of satellites use GaAs solar arrays with 28-39% efficiency), and military phased-array radar. GaN is the amplifier transistor in 5G base stations (present in roughly 67% of global 5G infrastructure), EV chargers, and data center power supplies. CIGS thin-film solar panels (CuInGaSe₂) use gallium in the absorber layer at a Ga/(Ga+In) ratio of 0.27-0.40. White LEDs for general lighting use GaN-on-sapphire structures.

For detailed data on each application: gallium in semiconductors, gallium in 5G, gallium in LEDs, gallium in aerospace, gallium in solar.

What Has Gallium's Price Done Since 2023?

Gallium 4N metal (99.99% purity) traded at approximately $220-300/kg through 2022. Following China's export licensing announcement in July 2023, prices rose more than 27% within weeks. By early 2024, 4N prices reached $755/kg. The December 2024 full US export ban pushed prices higher. By May 2025, the peak was reported near $687-750/kg depending on the source and transaction type. The November 2025 suspension of the US export ban brought some softening, but prices as of early 2026 remained well above pre-controls levels.

Argus Media publishes the industry benchmark price assessment for 4N and 6N gallium, used in long-term supply contracts. The 6N price trades at a 2-3x premium to 4N. See gallium price today for current assessed prices and gallium price history for the full dataset.

What Are the Milestones in Gallium's Commercial History?

Gallium's commercial history follows the development of compound semiconductor technology. The metal was a laboratory curiosity for 87 years after discovery, with no industrial application. The first GaAs laser in 1962 opened the compound semiconductor era. Nakamura's 1993 blue LED opened the white lighting and display era. The 5G rollout from 2019 onward created the largest single demand increase gallium has seen.