mineral

Bismuth crystal

Bismuth (Bi), commonly laboratory-grown

AI-generated identification · may be incorrect

Metallic luster with vivid iridescent yellow, purple, blue, and green oxide colors; Mohs hardness 2–2.5, brittle, very high density (~9.8 g/cm³), and a trigonal crystal structure. The stepped hopper-like edges are characteristic of crystallized bismuth.

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Usually produced by melting and slowly cooling refined bismuth, allowing skeletal hopper crystals to grow; natural bismuth occurs in hydrothermal veins formed at relatively low temperatures, commonly associated with tin, tungsten, lead, and copper ores.

Uses & applications

Primarily a mineralogical display and collector specimen; bismuth is also used in low-toxicity alloys, solders, ammunition, pharmaceuticals, pigments, and cosmetics.

Geological facts

Its rainbow coloration is a thin oxide film, not the native color of the metal, and can fade or change with abrasion, heat, or chemicals.

Field identification & locations

Identify by its extreme heft, brittle metallic body, stair-step hopper geometry, and iridescent surface. Common natural localities include Bolivia, Peru, Germany, China, and Canada; colorful geometric specimens are usually synthetic or refined-metal products.