Germanium Substitutes: Alternatives and Trade-offs

Germanium can be replaced in some applications and not in others. For certain electronic applications, USGS names silicon or gallium arsenide. It names substitutes for 4 applications in all, and the table below gives its wording for each, including where a substitute costs performance or does not exist.

What is germanium used for?

• Fiber optics: germanium dioxide and tetrachloride are consumed making fiber-optic glass for data networking and telecommunication; the largest US end use
• Infrared optics: germanium metal processed into lenses for infrared optical systems for commercial and government markets
• Semiconductors and solar cells: wafers used as substrates for multijunction solar cells in space, and germane gas for semiconductor and solar cell manufacturing
• Radiation detectors: high-purity germanium detectors

Which materials can replace germanium?

Frequently asked questions

What can replace germanium?

Certain electronic applications: silicon or gallium arsenide; High-frequency electronics and some LEDs: some metallic compounds; Infrared applications: chalcogenide glass.

What is germanium used for?

Germanium is used in fiber optics, infrared optics and semiconductors and solar cells. Fiber optics: germanium dioxide and tetrachloride are consumed making fiber-optic glass for data networking and telecommunication; the largest US end use.

Can germanium be recycled?

Much of the germanium machined away when making infrared optics is routinely recycled as new scrap, and lenses and windows in decommissioned military equipment, wastes from optical-fiber manufacture and solar-cell wafers are also recycled. USGS says the information was inadequate to estimate how much secondary germanium is produced.

Is germanium a critical mineral?

Yes. Germanium is on all four official critical minerals lists: the US, EU, Australian and Canadian. Germanium was already on the 2022 US list and stays on the final 2025 list of 60 minerals. US net import reliance for germanium in 2025 was more than 50%.

Sources

Read on October 14, 2026. Figures on this page come from these documents; where a number is an estimate, the source says so.

1. USGS Mineral Commodity Summaries 2026: Germanium. Production, reserves, uses, substitutes, recycling and events
2. USGS Mineral Commodity Summaries 2026: introduction (Table 7 and Figures 10A and 10B). Net import reliance, leading producer and price changes for critical minerals
3. Federal Register: Final 2025 List of Critical Minerals
4. EUR-Lex: Regulation (EU) 2024/1252
5. Department of Industry, Science and Resources: Australia’s Critical Minerals List and Strategic Materials List
6. Government of Canada: Canada’s critical minerals
7. EarthRarest price list. Dealer list price, read October 14, 2026; our sister business
8. Teck: other metals (indium and germanium)
9. USGS Minerals Yearbook 2023: Germanium (advance release, January 2026)
10. US Department of War: $11.8 million for domestic processing of critical materials, as posted on manufacturing.gov (20 February 2026)
11. Korea Zinc and Lockheed Martin germanium memorandum (PR Newswire release of 26 August 2025, as syndicated by Technode)
12. Yunnan Chihong Zinc & Germanium: 2025 annual report, in Chinese (27 March 2026)