China finds 99.9% pure quartz in Tibet that could reshape the global chip supply chain

In a discovery that could have significant consequences for the global semiconductor and clean energy supply chain, Chinese researchers have identified a major new source of high-purity quartz in Tibet, one that can be refined to a silica content exceeding 99.995 per cent. The find comes at a critical time: as China races to scale up solar panel and chip manufacturing to meet both domestic demand and global export targets, it has remained heavily dependent on imported high-grade quartz, much of it sourced from the United States. The new study, published in April 2026 in the European Journal of Mineralogy, evaluates leucogranite formations in the Dinggye area of Tibet as a viable domestic raw material and the results suggest the country may have been sitting on a strategic mineral reserve without knowing it.Quartz is the second most abundant mineral in Earth's crust, but high-purity quartz, the kind needed for advanced manufacturing, is far rarer and more demanding to produce. To qualify as high-purity, quartz must contain at least 99.9 per cent silicon dioxide (SiO₂), with strict upper limits on trace impurities such as aluminium, iron, titanium, and calcium.The properties that make high-purity quartz so valuable are its exceptional resistance to heat and chemical corrosion, its low thermal expansion, and its electrical insulation. These qualities make it indispensable in the fabrication of quartz crucibles, the vessels used to grow silicon ingots from which semiconductor wafers are sliced. The same material is also used in the production of polysilicon, the base ingredient in most solar photovoltaic cells, as well as in optical fibres, UV lamps, and precision electronic components. There is, in short, no substitute for it in these processes.The study published in the European Journal of Mineralogy focused specifically on leucogranites from the Dinggye region of Tibet. Leucogranites are pale, coarse-grained granite rocks that are exceptionally rich in quartz and feldspar. Researchers from the University of Science and Technology of China and the China Geological Survey conducted a detailed analysis of the mineral composition of these formations and tested their purification potential under laboratory conditions.The team found that the Tibetan leucogranites contain quartz grains with low concentrations of fluid inclusions and structural defects, both of which affect how cleanly the mineral can be refined. More importantly, the impurities present were found to be removable through standard processing techniques. Their analysis concluded that with appropriate refinement, these deposits could consistently yield quartz with silica content exceeding 99.995 per cent, well above the 99.9 per cent threshold required for industrial high-purity applications, and approaching the ultra-high-purity grades needed for advanced chip fabrication.China currently imports the bulk of its high-purity quartz, with a significant share coming from Spruce Pine, North Carolina, a small Appalachian mining district that accounts for a disproportionately large fraction of the world's highest-grade quartz supply. Spruce Pine's deposits are geologically unusual in their purity and have served as a linchpin of global semiconductor and solar manufacturing supply chains for decades. Any disruption to this source, whether from geopolitical tensions, extreme weather events, or regulatory changes, has the potential to stall chip and solar panel production worldwide.As the researchers behind the Tibetan study noted in their paper, global high-purity quartz resources are scarce and extremely unevenly distributed, creating substantial supply chain risks for industries that depend on them. For China in particular, which leads the world in both solar panel manufacturing and has ambitions to reduce its semiconductor dependence on foreign technology, this vulnerability has become a matter of national industrial strategy.The Tibet discovery is part of a broader and accelerating effort by China to secure domestic sources of this critical mineral. The country identified its first commercially viable high-purity quartz deposit in Henan province in 2020, followed by another in the Xinjiang region in 2021. Building on these findings, China's Ministry of Natural Resources formally added high-purity quartz to the country's official list of strategic minerals in 2025, designating it the 174th mineral resource to be developed under the national resource security policy.This classification is significant. It signals that the Chinese government views high-purity quartz not merely as a commodity but as a material whose domestic availability is directly tied to industrial sovereignty, particularly in semiconductors and renewable energy, two sectors at the heart of China's long-term economic competition with the United States and Europe.The researchers behind the European Journal of Mineralogy study were explicit about the strategic dimension of their work. They noted that leucogranite formations are widely distributed across the Tibetan Plateau, making the region a geologically promising target for high-purity quartz resource development at scale. The Dinggye deposits studied are just one of what may be multiple viable sites across the region.This matters because the challenge with high-purity quartz is not simply finding quartz it is finding quartz that is clean enough, consistent enough, and processable enough to meet industrial standards without prohibitive costs. The Tibetan leucogranites, according to the study, appear to meet these benchmarks. Their relatively simple mineralogy and low levels of structurally incorporated impurities make them well-suited to standard purification processes such as magnetic separation, acid leaching, and thermal treatment.If further geological surveys confirm the extent and quality of these deposits, Tibet could emerge as a meaningful domestic alternative to the imported high-purity quartz China currently relies on, reducing exposure to supply chain disruptions and giving Chinese manufacturers greater control over one of the most sensitive materials in modern industrial production.