mineral

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale); Color: White base with burnt-orange to deep brownish-yellow tips; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White base with burnt-orange to deep brownish-yellow tips
Luster: Vitreous (glassy)

Identified June 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed as amethyst in volcanic geodes. This specific specimen has been artificially heated (usually above 450 degrees Celsius) to change its color from purple to orange. Natural citrine is quite rare; most commercial citrine is heat-treated amethyst.

Uses & applications

Predominantly used for ornamental purposes, metaphysical and healing crystal markets, and affordable jewelry.

Geological facts

Natural citrine usually has a uniform pale yellow color without the white opaque base seen in this specimen. The dark burnt-orange tips are a diagnostic sign of heat-induced alteration of amethyst. It is often called 'burnt amethyst' by geologists.

Field identification & locations

Look for a concentrated orange color at the tips of the crystals and a stark white base. It is commonly found in Brazil and Uruguay. Collectors identify it by the lack of dichroism compared to natural citrine.