Both are byproduct metals critical to thermoelectric devices (bismuth telluride) and to lead-free solder and CdTe solar applications.
Bismuth: Bismuth is the primary non-toxic substitute for lead in ammunition, fishing weights, and solders. China dominates production, creating supply chain risk for industries seeking to eliminate lead.
Tellurium: Tellurium is critical for CdTe solar panels and thermoelectric devices. Its extreme rarity (rarer than gold) and complete dependence on copper refining by-product supply creates strategic risk.
Bismuth: Bismuth is a heavy, brittle, post-transition metal used in pharmaceuticals, cosmetics, alloys, and as a non-toxic substitute for lead. It is primarily recovered as a byproduct of lead and copper smelting. Tellurium: Tellurium is a rare metalloid used in cadmium telluride (CdTe) thin-film solar panels, thermoelectric devices, and semiconductor alloys. CdTe is the second most widely deployed solar technology globally.
As tracked by Critical Minerals HQ, Bismuth is currently $8 USD/kg and Tellurium is $63 USD/kg. The two minerals are quoted in different units (USD/kg vs USD/kg), so see the live price panels above for the most recent figures.
Neither is "better" in absolute terms — each is engineered for different end-uses. Bismuth is primarily used for: Pharmaceuticals (bismuth subsalicylate, stomach remedies), Low-melting alloys for fire sprinklers and fuses, Cosmetics and pigments, Lead-free solders and shot. Tellurium is primarily used for: Cadmium telluride (CdTe) thin-film solar panels, Thermoelectric cooling and power generation, Bismuth telluride thermoelectrics, Rewritable optical discs and semiconductors. The right mineral depends on the application.
Bismuth and Tellurium are quoted in different units (USD/kg vs USD/kg), so a direct numeric rarity comparison from spot price alone is indicative only. See the indexed 25-year chart on the live page for relative scarcity behavior.
Specific US import-reliance percentages are not in our on-file reference text for either Bismuth or Tellurium. See the official USGS Mineral Commodity Summaries for the latest figures.
Bismuth top producers (USGS): China, Peru, Mexico, Japan. Tellurium top producers: China, Japan, Russia, Canada. The mineral whose first-listed producer accounts for a larger share of global output carries the greater supply-chain concentration risk.
Bismuth: Bismuth is the primary non-toxic substitute for lead in ammunition, fishing weights, and solders. China dominates production, creating supply chain risk for industries seeking to eliminate lead. Tellurium: Tellurium is critical for CdTe solar panels and thermoelectric devices. Its extreme rarity (rarer than gold) and complete dependence on copper refining by-product supply creates strategic risk.