mineral

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown

AI-generated identification · may be incorrect

Metallic, strongly iridescent blue, gold, and purple surface; Mohs hardness 2–2.5, brittle, high density (~9.8 g/cm³), and rhombohedral crystal structure. The stepped, hopper-like form and rainbow oxide coating are characteristic.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Usually a human-grown bismuth crystal formed by melting purified bismuth and cooling it slowly; the colors come from a thin oxidation film, not natural mineral coloration. Natural native bismuth forms in hydrothermal ore deposits, commonly associated with tin, tungsten, and silver, over varied geologic ages.

Uses & applications

Primarily sold as a mineral specimen, educational display, or collectible; it has limited industrial use in low-melting alloys, solders, pharmaceuticals, and specialized pigments.

Geological facts

Bismuth is one of the heaviest naturally occurring elements and is notably diamagnetic. Its oxide colors can fade or change with abrasion, heat, or chemicals.

Field identification & locations

Identify by its unusually dense feel, brittle metallic crystals, hopper/terraced geometry, and vivid oxidation colors; it is commonly produced commercially rather than collected in the field. Avoid handling with acids or scratching the delicate surface.