New germanium-rich mineral find can add to China's edge in strategic metals

Chinese scientists have identified a new germanium-rich mineral, wusiheite, a discovery that provides fresh insight into how the strategic metal becomes highly concentrated in ore deposits and could help improve its extraction and utilization.

The mineral is China's first independently identified germanate mineral and provides direct mineralogical evidence of a mechanism by which germanium becomes exceptionally concentrated in ore deposits, experts said.

Wusiheite was approved earlier this month by the International Mineralogical Association's Commission on New Minerals, Nomenclature and Classification. It was discovered by researchers from Chang'an University in Shaanxi province, the Chinese Academy of Sciences' Guangzhou Institute of Geochemistry in Guangdong province and the CAS Institute of Geochemistry in Guizhou province.

Germanium is a scarce strategic metal essential to a range of modern industries, including semiconductors, fiber-optic communications, infrared optics, solar cells and aerospace monitoring systems. Because it is rare in the Earth's crust and almost never forms independent minerals, germanium has traditionally been recovered mainly as a by-product of lead-zinc and coal mining.

Wen Hanjie, dean of the School of Earth Sciences and Resources at Chang'an University, who led the discovery, said the key challenge in utilizing germanium is locating, concentrating and purifying trace amounts of the metal from bulk minerals.

"In the Sichuan-Yunnan-Guizhou region — one of the world's most prominent germanium-enriched lead-zinc areas — germanium enters sphalerite as a trace element or exists in extremely fine independent minerals," Wen said.

This makes extraction difficult because even when a mineral is rich in germanium, its low abundance in an ore means it cannot simply be crushed and sorted in the same way as iron or gold.

China, however, has built a dominant position in the global germanium supply chain. According to the Ministry of Natural Resources, China's germanium reserves ranked first in the world by the end of the 14th Five-Year Plan period (2021-25). S&P Global, a United States-based financial information services company, estimated that China accounted for roughly 91 percent of global primary germanium output in 2025 and more than 90 percent of the world's refining capacity.

Since 2023, researchers have conducted systematic mineralogical studies of the Wusihe lead-zinc deposit in Sichuan province. Their work has revealed abundant independent germanium-bearing minerals, among which wusiheite stands out as a newly identified germanium-rich species.

Unlike previously identified germanium-bearing minerals, in which germanium exists as a trace impurity or substitutes for other elements, germanium in wusiheite is a backbone element of the crystal structure, which is composed of barium, germanium and oxygen.

Wen said this fundamental distinction was key to the mineral's formal classification as an independent germanate mineral. The finding gives wusiheite a unique position in mineralogical taxonomy and could potentially reduce the separation burden in downstream beneficiation compared with recovering germanium as a by-product.

Under a microscope, wusiheite appears as transparent, tabular crystals measuring 1 to 20 micrometers. It is dark gray in reflected light and shows no pleochroism. With an average germanium oxide content of 72 percent, it is the third germanium-rich mineral identified at the deposit, following ruizhongite and wenqingite.

"The successive appearance of three such minerals suggests the deposit may host a yet to be fully understood enrichment mechanism in its hydrothermal fluids, shifting the question of whether germanium can form independent minerals from a theoretical exception to a possibility worth systematic exploration," Wen said.

The discovery comes as germanium has moved from a niche industrial metal to a focal point of global critical mineral competition. The United States Geological Survey listed it among the minerals with the highest supply chain risk in its 2025 critical mineral assessment, while the European Union has included it on its critical raw materials list.

China imposed export licensing requirements on certain gallium-and germanium-related dual-use items in August 2023, further raising international attention on the security of global supply chains for the two metals.

"The real long-term strategic value is not how many metric tons of production a single mineral discovery can add, but whether a country can continuously convert potential resources into identifiable, evaluable, recoverable and usable resources through fundamental scientific understanding," Wen said.